Add Storage Policy Support for /Info

Registers policies to report on /info enpoint both the policy names
and the types of policies.

Also updated test_storage_policies.py to use the new @patch_policies
to be consistent with other policy related test code.

Change-Id: I28db4d1b501fd193db93f18379414cd0dc77ac17
Implements: blueprint storage-policies
Merge "Add Storage Policy Support for /Info" into feature/ec