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/templates/cookied-cicd-k8s-calico/deploy-and-test.groovy b/tcp_tests/templates/cookied-cicd-k8s-calico/deploy-and-test.groovy
index 2d691fb..83335a9 100644
--- a/tcp_tests/templates/cookied-cicd-k8s-calico/deploy-and-test.groovy
+++ b/tcp_tests/templates/cookied-cicd-k8s-calico/deploy-and-test.groovy
@@ -46,7 +46,7 @@
             export salt_master_port=6969
             export SALT_USER=\$SALTAPI_USER
             export SALT_PASSWORD=\$SALTAPI_PASS
-            export COMMON_SERVICES_INSTALLED=true  # skip common_services_deployed fixture
+            export CORE_INSTALLED=true  # skip core_deployed fixture
             export K8S_INSTALLED=true              # skip k8s_deployed fixture
 
             py.test -vvv -s -p no:django -p no:ipdb --junit-xml=nosetests.xml -m k8s_calico