Add encryption types test

Adds patrole tests for the encryptions types client. Also
refactors test_volume_types_extra_specs to make use of the
create_volume_type class method.

Change-Id: Ice66abb1546e4f0d882927b0489f3ab1cf330c01
Implements: bp: rbac-tests-for-encryption-types-client
Depends-On: I1a52fca1360afb8544148e9e0e8fc2905e74db0a
3 files changed