Change the etcd type name to lower case, it's changed in the latest etcd operator

Change-Id: Ia04280f5f8294d570a2023650078f08a67e2f309
diff --git a/tests/functional/K8S_SystemTest.robot b/tests/functional/K8S_SystemTest.robot
index ca75ff1..615c538 100644
--- a/tests/functional/K8S_SystemTest.robot
+++ b/tests/functional/K8S_SystemTest.robot
@@ -22,9 +22,9 @@
 ${desired_ETCD_cluster_size}        3
 ${minimal_ETCD_cluster_size}        2
 ${namespace}        voltha
-${ETCD_resources}        ETCDclusters.ETCD.database.coreos.com
-${ETCD_name}       voltha-ETCD-cluster
-${ETCD_pod_label_key}    ETCD_cluster
+${ETCD_resources}        etcdclusters.etcd.database.coreos.com
+${ETCD_name}       voltha-etcd-cluster
+${ETCD_pod_label_key}    etcd_cluster
 ${common_pod_label_key}    app
 ${rwcore_pod_label_value}    rw-core
 ${ofagent_pod_label_value}    ofagent