Port inventory source injector tests to functional tests

This new batch of tests assures that the injector logic
for inventory source in their old script version remains
untouched with the refactoring underway.

Plugins are also tested by the same means of comparing
to reference files, these will be used to assure that
all parameters that used to be respected are still
respected in the plugin system.

awx/main/tests/data/inventory/scripts/vmware/VMWARE_INI_PATH

@@ -0,0 +1,10 @@
+[vmware]
+cache_max_age = 0
+validate_certs = False
+username = fooo
+password = fooo
+server = https://foo.invalid
+base_source_var = value_of_var
+host_filters = foobaa
+groupby_patterns = fouo
+