Run unit tests for all Python versions in one CI node. (#2)

tests/utils/shippable/units.sh

@@ -5,8 +5,7 @@ set -o pipefail -eux
 declare -a args
 IFS='/:' read -ra args <<< "$1"
 
-version="${args[1]}"
-group="${args[2]}"
+group="${args[1]}"
 
 if [[ "${COVERAGE:-}" == "--coverage" ]]; then
     timeout=90
@@ -23,5 +22,5 @@ esac
 ansible-test env --timeout "${timeout}" --color -v
 
 # shellcheck disable=SC2086
-ansible-test units --color -v --docker default --python "${version}" ${COVERAGE:+"$COVERAGE"} ${CHANGED:+"$CHANGED"} \
+ansible-test units --color -v --docker default ${COVERAGE:+"$COVERAGE"} ${CHANGED:+"$CHANGED"} \
     "${options[@]:+${options[@]}}" \