Fix a spelling mistake

Change-Id: I69db28f00d8af3df9d0700a732949fccb5a278ef
diff --git a/octavia_tempest_plugin/tests/test_base.py b/octavia_tempest_plugin/tests/test_base.py
index 825b758..57d3db9 100644
--- a/octavia_tempest_plugin/tests/test_base.py
+++ b/octavia_tempest_plugin/tests/test_base.py
@@ -75,7 +75,7 @@
 
         for service, available in service_list.items():
             if not available:
-                skip_msg = ("{0} skipped as {1} serivce is not "
+                skip_msg = ("{0} skipped as {1} service is not "
                             "available.".format(cls.__name__, service))
                 raise cls.skipException(skip_msg)