This microversion implements below API cleanups:
1. 400 for unknown param for query param and for request body.
2. Making server representation always consistent among all APIs
returning the complete server representation.
3. Change the default return value of ``swap`` field from the empty string
to 0 (integer) in flavor APIs.
4. Return ``servers`` field always in the response of GET
hypervisors API even there are no servers on hypervisor
Partial-Implements: blueprint api-consistency-cleanup