delete device testcase + test improvements

Change-Id: Ia2b6d5c2912e5c513e2ac08efa1a691a89d4c5c0
diff --git a/variables/variables.robot b/variables/variables.robot
index 927e5f6..e518ba6 100644
--- a/variables/variables.robot
+++ b/variables/variables.robot
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 *** Variables ***
-${BBSIM_SERVICE}        bbsim.voltha.svc
+${BBSIM_IP}             bbsim.voltha.svc
 ${BBSIM_PORT}           50060
 ${BBSIM_DEVICE_ID}      of:0000626273696d76
 ${BBSIM_OLT_SN}         BBSIMOLT000