Remove volume_feature_enabled.volume_services

653f5cb70c0469b53f8baca3e0158fa57b24310e deprecated this config
option in the Ocata cycle and can now be removed.

Change-Id: I744fea85881ec621e12744b6dc5a81f18c4b11d5
diff --git a/tempest/config.py b/tempest/config.py
index bd19967..6d3bb99 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -801,14 +801,7 @@
                 help="Is the v2 volume API enabled"),
     cfg.BoolOpt('api_v3',
                 default=False,
-                help="Is the v3 volume API enabled"),
-    # TODO(ynesenenko): Remove volume_services once liberty-eol happens.
-    cfg.BoolOpt('volume_services',
-                default=True,
-                help='Extract correct host info from host@backend',
-                deprecated_for_removal=True,
-                deprecated_reason='This config switch was added for Liberty '
-                                  'which is not supported anymore.')
+                help="Is the v3 volume API enabled")
 ]