Add new default Docker container for ansible-test. (#31944)

* Add new default Docker container for ansible-test.
* Update ansible-test change classification.
* Update list of disabled pylint rules.
* Fix pylint issues with ansible-test.

test/runner/docker/deadsnakes.list

@@ -0,0 +1,2 @@
+deb http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial main
+deb-src http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial main

test/runner/docker/requirements.sh

@@ -0,0 +1,23 @@
+#!/bin/bash -eu
+
+python_versions=(
+    2.6
+    2.7
+    3.5
+    3.6
+)
+
+requirements=()
+
+for requirement in *.txt; do
+    if [ "${requirement}" != "constraints.txt" ]; then
+        requirements+=("-r" "${requirement}")
+    fi
+done
+
+for python_version in "${python_versions[@]}"; do
+    set -x
+    "python${python_version}" /tmp/get-pip.py -c constraints.txt
+    "pip${python_version}" install --disable-pip-version-check -c constraints.txt "${requirements[@]}"
+    set +x
+done