Vendor API connection code from Docker SDK for Python (#398)

* Vendor parts of the Docker SDK for Python

This is a combination of the latest git version
(https://github.com/docker/docker-py/tree/a48a5a9647761406d66e8271f19fab7fa0c5f582)
and the version before Python 2.7 support was removed
(https://github.com/docker/docker-py/tree/650aad3a5fb84059b392ad450f760ed08143ae3f),
including some modifications to work with Ansible module_utils's
system (i.e. third-party imports are guarded, and errors are
reported during runtime through a new exception
MissingRequirementException).

* Create module_utils and plugin_utils for working with the vendored code.

The delete call cannot be called delete() since that method already exists from requests.

* Vendor more code from Docker SDK for Python.

* Adjust code from common module_utils.

* Add unit tests from Docker SDK for Python.

* Make test compile with Python 2.6, but skip them on Python 2.6.

* Skip test that requires a network server.

* Add changelog.

* Update changelogs/fragments/398-docker-api.yml

Co-authored-by: Brian Scholer <1260690+briantist@users.noreply.github.com>

* Minimum API version is 1.25.

Co-authored-by: Brian Scholer <1260690+briantist@users.noreply.github.com>

plugins/module_utils/_api/errors.py

@@ -0,0 +1,220 @@
+# -*- coding: utf-8 -*-
+# This code is part of the Ansible collection community.docker, but is an independent component.
+# This particular file, and this file only, is based on the Docker SDK for Python (https://github.com/docker/docker-py/)
+#
+# Copyright (c) 2016-2022 Docker, Inc.
+#
+# It is licensed under the Apache 2.0 license (see Apache-2.0.txt in this collection)
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+from ._import_helper import HTTPError as _HTTPError
+
+
+class DockerException(Exception):
+    """
+    A base class from which all other exceptions inherit.
+
+    If you want to catch all errors that the Docker SDK might raise,
+    catch this base exception.
+    """
+
+
+def create_api_error_from_http_exception(e):
+    """
+    Create a suitable APIError from requests.exceptions.HTTPError.
+    """
+    response = e.response
+    try:
+        explanation = response.json()['message']
+    except ValueError:
+        explanation = (response.content or '').strip()
+    cls = APIError
+    if response.status_code == 404:
+        if explanation and ('No such image' in str(explanation) or
+                            'not found: does not exist or no pull access'
+                            in str(explanation) or
+                            'repository does not exist' in str(explanation)):
+            cls = ImageNotFound
+        else:
+            cls = NotFound
+    raise cls(e, response=response, explanation=explanation)
+
+
+class APIError(_HTTPError, DockerException):
+    """
+    An HTTP error from the API.
+    """
+    def __init__(self, message, response=None, explanation=None):
+        # requests 1.2 supports response as a keyword argument, but
+        # requests 1.1 doesn't
+        super(APIError, self).__init__(message)
+        self.response = response
+        self.explanation = explanation
+
+    def __str__(self):
+        message = super(APIError, self).__str__()
+
+        if self.is_client_error():
+            message = '{0} Client Error for {1}: {2}'.format(
+                self.response.status_code, self.response.url,
+                self.response.reason)
+
+        elif self.is_server_error():
+            message = '{0} Server Error for {1}: {2}'.format(
+                self.response.status_code, self.response.url,
+                self.response.reason)
+
+        if self.explanation:
+            message = '{0} ("{1}")'.format(message, self.explanation)
+
+        return message
+
+    @property
+    def status_code(self):
+        if self.response is not None:
+            return self.response.status_code
+
+    def is_error(self):
+        return self.is_client_error() or self.is_server_error()
+
+    def is_client_error(self):
+        if self.status_code is None:
+            return False
+        return 400 <= self.status_code < 500
+
+    def is_server_error(self):
+        if self.status_code is None:
+            return False
+        return 500 <= self.status_code < 600
+
+
+class NotFound(APIError):
+    pass
+
+
+class ImageNotFound(NotFound):
+    pass
+
+
+class InvalidVersion(DockerException):
+    pass
+
+
+class InvalidRepository(DockerException):
+    pass
+
+
+class InvalidConfigFile(DockerException):
+    pass
+
+
+class InvalidArgument(DockerException):
+    pass
+
+
+class DeprecatedMethod(DockerException):
+    pass
+
+
+class TLSParameterError(DockerException):
+    def __init__(self, msg):
+        self.msg = msg
+
+    def __str__(self):
+        return self.msg + (". TLS configurations should map the Docker CLI "
+                           "client configurations. See "
+                           "https://docs.docker.com/engine/articles/https/ "
+                           "for API details.")
+
+
+class NullResource(DockerException, ValueError):
+    pass
+
+
+class ContainerError(DockerException):
+    """
+    Represents a container that has exited with a non-zero exit code.
+    """
+    def __init__(self, container, exit_status, command, image, stderr):
+        self.container = container
+        self.exit_status = exit_status
+        self.command = command
+        self.image = image
+        self.stderr = stderr
+
+        err = ": {0}".format(stderr) if stderr is not None else ""
+        msg = ("Command '{0}' in image '{1}' returned non-zero exit "
+               "status {2}{3}").format(command, image, exit_status, err)
+
+        super(ContainerError, self).__init__(msg)
+
+
+class StreamParseError(RuntimeError):
+    def __init__(self, reason):
+        self.msg = reason
+
+
+class BuildError(DockerException):
+    def __init__(self, reason, build_log):
+        super(BuildError, self).__init__(reason)
+        self.msg = reason
+        self.build_log = build_log
+
+
+class ImageLoadError(DockerException):
+    pass
+
+
+def create_unexpected_kwargs_error(name, kwargs):
+    quoted_kwargs = ["'{0}'".format(k) for k in sorted(kwargs)]
+    text = ["{0}() ".format(name)]
+    if len(quoted_kwargs) == 1:
+        text.append("got an unexpected keyword argument ")
+    else:
+        text.append("got unexpected keyword arguments ")
+    text.append(', '.join(quoted_kwargs))
+    return TypeError(''.join(text))
+
+
+class MissingContextParameter(DockerException):
+    def __init__(self, param):
+        self.param = param
+
+    def __str__(self):
+        return ("missing parameter: {0}".format(self.param))
+
+
+class ContextAlreadyExists(DockerException):
+    def __init__(self, name):
+        self.name = name
+
+    def __str__(self):
+        return ("context {0} already exists".format(self.name))
+
+
+class ContextException(DockerException):
+    def __init__(self, msg):
+        self.msg = msg
+
+    def __str__(self):
+        return (self.msg)
+
+
+class ContextNotFound(DockerException):
+    def __init__(self, name):
+        self.name = name
+
+    def __str__(self):
+        return ("context '{0}' not found".format(self.name))
+
+
+class MissingRequirementException(DockerException):
+    def __init__(self, msg, requirement, import_exception):
+        self.msg = msg
+        self.requirement = requirement
+        self.import_exception = import_exception
+
+    def __str__(self):
+        return (self.msg)