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/fixtures/stacklight_fixtures.py b/tcp_tests/fixtures/stacklight_fixtures.py
index c1747b8..2c30530 100644
--- a/tcp_tests/fixtures/stacklight_fixtures.py
+++ b/tcp_tests/fixtures/stacklight_fixtures.py
@@ -35,11 +35,11 @@
     return sl_manager.SLManager(config, underlay, salt_deployed)
 
 
-@pytest.mark.revert_snapshot(ext.SNAPSHOT.sl_deployed)
+@pytest.mark.revert_snapshot(ext.SNAPSHOT.stacklight_deployed)
 @pytest.fixture(scope='function')
-def sl_deployed(revert_snapshot, request, config,
-                hardware, underlay, common_services_deployed,
-                salt_deployed, sl_actions):
+def stacklight_deployed(revert_snapshot, request, config,
+                        hardware, underlay, core_deployed,
+                        salt_deployed, sl_actions):
     """Fixture to get or install SL services on environment
 
     :param revert_snapshot: fixture that reverts snapshot that is specified
@@ -56,7 +56,7 @@
         steps_path = config.sl_deploy.sl_steps_path
         commands = underlay.read_template(steps_path)
         sl_actions.install(commands)
-        hardware.create_snapshot(ext.SNAPSHOT.sl_deployed)
+        hardware.create_snapshot(ext.SNAPSHOT.stacklight_deployed)
         salt_deployed.sync_time()
 
     else:
@@ -70,16 +70,16 @@
     return sl_actions
 
 
-@pytest.mark.revert_snapshot(ext.SNAPSHOT.sl_deployed)
+@pytest.mark.revert_snapshot(ext.SNAPSHOT.stacklight_deployed)
 @pytest.fixture(scope='function')
 def sl_os_deployed(revert_snapshot,
                    openstack_deployed,
-                   sl_deployed):
+                   stacklight_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.
+    Uses fixtures openstack_deployed and stacklight_deployed,
+    with 'stacklight_deployed' top-level snapshot.
 
     Returns SLManager instance object
     """
-    return sl_deployed
+    return stacklight_deployed