Converted tower_group

Splitting out tower_inventory_source from tower_group

Copy/Paste typo fix and README update for breaking backwards compatability

Update credential_type module and unit tests

awx_collection/plugins/modules/tower_inventory.py

@@ -117,7 +117,7 @@ def main():
         }
     })
 
-    # Create data to sent to create and update
+    # Create the data sent to create and update
     inventory_fields = {
         'name': name,
         'description': description,