Primary development of inventory plugins, partial compat layer

Initialize some inventory plugin test data files
Implement openstack inventory plugin

This may be removed later:
- port non-JSON line strip method from core

Dupliate effort with AWX mainline devel
- Produce ansible_version related to venv

Refactor some of injector management, moving more
  of this overhead into tasks.py, when it comes to
  managing injector kwargs

Upgrade and move openstack inventory script
  sync up parameters

Add extremely detailed logic to inventory file creation
for ec2, Azure, and gce so that they are closer to a
genuine superset of what the contrib script used to give.

awx/main/tests/unit/utils/test_ansible.py

@@ -1,5 +1,6 @@
 import os
 import os.path
+import json
 
 import pytest
 
@@ -31,3 +32,10 @@ def test_could_be_inventory(filename):
 def test_is_not_inventory(filename):
     path = os.path.join(DATA, 'inventories', 'invalid')
     assert could_be_inventory(DATA, path, filename) is None
+
+
+def test_filter_non_json_lines():
+    data = {'foo': 'bar', 'bar': 'foo'}
+    dumped_data = json.dumps(data, indent=2)
+    output = 'Openstack does this\nOh why oh why\n{}\ntrailing lines\nneed testing too'.format(dumped_data)
+    assert filter_non_json_lines(output) == dumped_data