Add extra apis to volume v3 services client

Just like compute services client (Nova), volume services client (Cinder)
also has some extra apis, such as 'enable_service', 'disable_service',
'disable_log_reason', 'freeze_host' and 'thaw_host'. This patch supplements
these five apis to volume v3 services client.

As it maybe dangerous for Tempest gate jobs to test these apis, only some
negative tests are provided.

Including:

[1] Add the apis to volume v3 services_client
[2] Add unit tests for these apis
[3] Add release note
[4] Add negative tests

Change-Id: Ic7c170122321483a89d399f67ce4441b00dfc781
4 files changed