Rename core fixtures to match the drivetrain component names

The following changes:
  common_services_deployed -> core_deployed
  sl_deployed -> stacklight_deployed

Change-Id: I6e505d2ef96053b19b2d43b0214f5a30f71ae8ea
diff --git a/tcp_tests/tests/system/test_failover_ceph.py b/tcp_tests/tests/system/test_failover_ceph.py
index 2f1bc25..934e28b 100644
--- a/tcp_tests/tests/system/test_failover_ceph.py
+++ b/tcp_tests/tests/system/test_failover_ceph.py
@@ -110,7 +110,7 @@
     @pytest.mark.fail_snapshot
     def test_restart_cmn_node(self, func_name, underlay, config,
                               openstack_deployed, ceph_deployed,
-                              common_services_actions,
+                              core_actions,
                               salt_actions, openstack_actions,
                               rally, show_step, hardware):
         """Test restart ceph cmn node
@@ -177,7 +177,7 @@
     @pytest.mark.fail_snapshot
     def test_restart_rgw_node(self, func_name, underlay, config,
                               openstack_deployed, ceph_deployed,
-                              common_services_actions, hardware,
+                              core_actions, hardware,
                               salt_actions, openstack_actions,
                               rally, show_step):
         """Test restart ceph rgw node