Add HA cases for rabbitmq and galera

- kill rabbitmq_server on random node
- kill mysql server on node with maximum mysql connections

Change-Id: I8cf1aab4a4213c339ddefcecaa86d9a80d52acdb
diff --git a/tcp_tests/fixtures/oss_fixtures.py b/tcp_tests/fixtures/oss_fixtures.py
index a74313b..95bbc54 100644
--- a/tcp_tests/fixtures/oss_fixtures.py
+++ b/tcp_tests/fixtures/oss_fixtures.py
@@ -79,3 +79,18 @@
         pass
 
     return oss_actions
+
+
+@pytest.mark.revert_snapshot(ext.SNAPSHOT.oss_deployed)
+@pytest.fixture(scope='function')
+def oss_sl_os_deployed(revert_snapshot,
+                       sl_os_deployed,
+                       oss_deployed):
+    """Fixture to get or install SL and OpenStack services on environment
+
+    Uses fixtures openstack_deployed and sl_deployed, with 'sl_deployed'
+    top-level snapshot.
+
+    Returns SLManager instance object
+    """
+    return oss_deployed