AS-260: Change max manifest testing to batch API calls

Retrospectively, this likely should have been in multiple PRs.
The way the cafe framework is structured, the client methods are intended to map directly to the REST API, so it need to include all possible parameters for policy creation. There are generally behaviors created with reduced sets that are then called from the test scripts. 

In this particular case, since we do not currently implement cloud_monitoring policies a number of parameters could be removed, but then "create_policy_batch" would not longer be consistent with the "create_policy" method.