API URI format change

Changes API URI format for monitoring and data API.
Fixes tests for API changes.
Adds tempest test and client for monitoring.

APIImpact

Change-Id: Iad2bcacbd2d3b8d4d89919d0bd9b71bdd419092c
Implements: blueprint api-uri-format-change
oslo.messaging update

oslo.messaging has been updated to >=1.4.0,!=1.5.0
oslo.serialization added

Change-Id: I1f5b824f72955a8cb5e8ea82328125f6b98c7766
Merge "API URI format change"