Adds basic CRUD on traits, including set and delete of individual
traits.
Bumps the API microversion to 1.37.
NOTE: This patch does not implement the advanced filtering outlined in
the OpenStack API working group's tags guidelines[1]. That will be
implemented in a separate microversion as a follow up patch.
[1] http://specs.openstack.org/openstack/api-wg/guidelines/tags.html
Change-Id: I313fa01fbf20bf0ff19f102ea63b02e72ac2b856
Partial-Bug: #1722194
Co-Authored-By: Mark Goddard <mark@stackhpc.com>
864331a94b