Stop adding ServiceAvailable group option

Service available group already exists.Therefore we don't need to
register this group here again.

Change-Id: I9680abe0a177a80860ec6ba1dbacc04fac41758d
Closes-Bug: #1621036
diff --git a/manila_tempest_tests/config.py b/manila_tempest_tests/config.py
index f0c8dc7..1c1735d 100644
--- a/manila_tempest_tests/config.py
+++ b/manila_tempest_tests/config.py
@@ -17,14 +17,10 @@
 
 from oslo_config import cfg
 
-service_available_group = cfg.OptGroup(name="service_available",
-                                       title="Available OpenStack Services")
-
-ServiceAvailableGroup = [
-    cfg.BoolOpt("manila",
-                default=True,
-                help="Whether or not manila is expected to be available"),
-]
+service_option = cfg.BoolOpt("manila",
+                             default=True,
+                             help="Whether or not manila is expected to be "
+                                  "available")
 
 share_group = cfg.OptGroup(name="share", title="Share Service Options")