Integrate Ansible core tower modules content into AWX

This commit includes all the changes involved in
converting the old Ansible Tower modules from commits
in Ansible core into the AWX collection that replaces it.
Also includes work needed to integrate it into the
AWX processes like tests, docs, and the Makefile.

Apply changes from content_collector tool

Add integrated module tests
  operate via run_module fixture
  add makefile target for them

Add flake8 target and fix flake8 errors

Update README

Make consolidated target for testing modules

Makefile

@@ -18,6 +18,7 @@ COMPOSE_TAG ?= $(GIT_BRANCH)
 COMPOSE_HOST ?= $(shell hostname)
 
 VENV_BASE ?= /venv
+MODULES_VENV ?= /awx_devel/awx_modules_test_venv
 SCL_PREFIX ?=
 CELERY_SCHEDULE_FILE ?= /var/lib/awx/beat.db
 
@@ -373,8 +374,31 @@ test:
 	fi; \
 	PYTHONDONTWRITEBYTECODE=1 py.test -p no:cacheprovider -n auto $(TEST_DIRS)
 	cd awxkit && $(VENV_BASE)/awx/bin/tox -re py2,py3
+	make test_modules_all
 	awx-manage check_migrations --dry-run --check  -n 'vNNN_missing_migration_file'
 
+prepare_modules_venv:
+	cd /awx_devel
+	rm -rf $(MODULES_VENV)
+	mkdir $(MODULES_VENV)
+	ln -s /usr/lib/python2.7/site-packages/ansible $(MODULES_VENV)/ansible
+	$(VENV_BASE)/awx/bin/pip install --target=$(MODULES_VENV) git+https://github.com/ansible/tower-cli.git
+
+MODULES_TEST_DIRS ?= awx_modules/test/awx
+
+test_modules:
+	@if [ "$(VENV_BASE)" ]; then \
+		. $(VENV_BASE)/awx/bin/activate; \
+	fi; \
+	PYTHONPATH=$(MODULES_VENV):/awx_devel/awx_modules:$PYTHONPATH py.test $(MODULES_TEST_DIRS)
+
+flake8_modules:
+	flake8 awx_modules/  # Different settings, in main exclude list
+
+prepare_test_modules: prepare_modules_venv test_modules  # deprecated
+
+test_modules_all: prepare_modules_venv test_modules flake8_modules
+
 test_unit:
 	@if [ "$(VENV_BASE)" ]; then \
 		. $(VENV_BASE)/awx/bin/activate; \