Fix default upgrade target for upgrade gateway job

Change-Id: I02f254001d32957ab42e053ebe692ab7eb33d5de
diff --git a/jenkins/client/job/deploy/update/upgrade_ovs_gateway.yml b/jenkins/client/job/deploy/update/upgrade_ovs_gateway.yml
index 4753cea..76bf436 100644
--- a/jenkins/client/job/deploy/update/upgrade_ovs_gateway.yml
+++ b/jenkins/client/job/deploy/update/upgrade_ovs_gateway.yml
@@ -43,5 +43,5 @@
               description: "Ask interactive questions during pipeline run (bool)"
             TARGET_SERVERS:
               type: string
-              default: 'ctl*'
+              default: 'gtw*'
               description: "Salt compound expression to get control servers to upgrade."