Fix wrong field rename

* Multiple credentialtype's have the same kind and kind values look
  like: cloud, network, machine, etc.
* namespace is the field that we want to rename

Author: chrismeyersfsu

awx/main/migrations/0204_squashed_deletions.py

@@ -12,7 +12,7 @@ def update_github_app_kind(apps, schema_editor):
     """
     CredentialType = apps.get_model('main', 'CredentialType')
     db_alias = schema_editor.connection.alias
-    CredentialType.objects.using(db_alias).filter(kind='github_app').update(kind='github_app_lookup')
+    CredentialType.objects.using(db_alias).filter(namespace='github_app').update(namespace='github_app_lookup')
 
 
 # --- END of function merged from 0203_rename_github_app_kind.py ---