Remove XML support from flavor v3 API plugins

Remove XML support from the following v3 compute API plugins:

 - flavor_access
 - flavor_manage
 - flavor_rxtx
 - flavors
 - flavors_extraspecs

Part of blueprint remove-v3-xml-api

DocImpact

Change-Id: I9745285cb6053dcb634c23002f1f24412dc62021
Remove XML support from quota and scheduler_hints v3 API plugins

Remove XML support from the following v3 compute API plugins:

 - quota_classes
 - quota_sets
 - scheduler_hints

Part of blueprint remove-v3-xml-api

DocImpact

Change-Id: I3ce2bcb1a7d7e152b0bfb96316ce8f1aab10061d
Remove XML support from some server v3 API plugins

Remove XML support from the following v3 compute API plugins:

 - security_groups
 - server_diagnostics
 - server_metadata
 - server_password
 - server_usage

Part of blueprint remove-v3-xml-api

DocImpact

Change-Id: If3e8d82d6db2a2ff328ba477bffd5081f098be9a
Merge "Remove XML support from some server v3 API plugins"
Merge "Remove XML support from flavor v3 API plugins"
Merge "Remove XML support from quota and scheduler_hints v3 API plugins"