add postgres Fact model, update views, tests

* awx.main.models Fact added
* view host fact and timeline updated to use new Postgres Fact model instead of Mongo
* Removed license set start Mongo logic
* added View tests
* added Model tests
* Removed mongo fact unit tests
* point at modified jsonbfield that supports sqlite storage driver
* postgresify fact cache receiver
* test OPTIONS endpoint
* Note: single fact view not implemented yet.

requirements/requirements.txt

@@ -49,7 +49,7 @@ importlib==1.0.3
 ipaddress==1.0.14
 iso8601==0.1.10
 isodate==0.5.1
-git+https://github.com/chrismeyersfsu/django-jsonbfield@master#egg=django-jsonbfield
+git+https://github.com/chrismeyersfsu/django-jsonbfield@fix-sqlite_serialization#egg=django-jsonbfield
 jsonpatch==1.11
 jsonpointer==1.9
 jsonschema==2.5.1

requirements/requirements_dev.txt

@@ -7,3 +7,4 @@ pytest
 pytest-cov
 pytest-django
 pytest-pythonpath
+pytest-mock

requirements/requirements_jenkins.txt

@@ -13,3 +13,4 @@ pytest
 pytest-cov
 pytest-django
 pytest-pythonpath
+pytest-mock