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
diff --git a/releasenotes/notes/add-extra-apis-to-volume-v3-services-client-bf9b235cf5a611fe.yaml b/releasenotes/notes/add-extra-apis-to-volume-v3-services-client-bf9b235cf5a611fe.yaml
new file mode 100644
index 0000000..03d0ae8
--- /dev/null
+++ b/releasenotes/notes/add-extra-apis-to-volume-v3-services-client-bf9b235cf5a611fe.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Add ``enable_service``, ``disable_service`` , ``disable_log_reason``,
+    ``freeze_host`` and ``thaw_host`` API endpoints to volume v3
+    ``services_client``.