Manila client needs to provide 'X-Openstack-Manila-Api-Version' in the
HTTP request header along with the appropriate version. Manila client
also needs to provide 'X-OpenStack-Manila-API-Experimental' in the HTTP
request header for APIs that are marked as experimental. This is a
temporary fix until Manila client can support Nova style microversions.
Closes-bug: #1489450
Change-Id: I6344dfa6d272f0e813a4873c015be614ebeb4e7e