Stop adding ServiceAvailable group option

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

Change-Id: I930e53e4934d72ed76735847581932fd227be2f0
Closes-Bug: #1621036
diff --git a/ironic_tempest_plugin/config.py b/ironic_tempest_plugin/config.py
index 00540cf..e586900 100644
--- a/ironic_tempest_plugin/config.py
+++ b/ironic_tempest_plugin/config.py
@@ -12,17 +12,10 @@
 
 from oslo_config import cfg
 
-from tempest import config  # noqa
-
-service_available_group = cfg.OptGroup(name="service_available",
-                                       title="Available OpenStack Services")
-
-ServiceAvailableGroup = [
-    cfg.BoolOpt("ironic-inspector",
-                default=True,
-                help="Whether or not ironic-inspector is expected to be"
-                " available"),
-]
+service_option = cfg.BoolOpt("ironic-inspector",
+                             default=True,
+                             help="Whether or not ironic-inspector is expected"
+                                  " to be available")
 
 baremetal_introspection_group = cfg.OptGroup(
     name="baremetal_introspection",