Merge pull request #12386 from jtattermusch/perfworker_script

Update the perfworker creation script
diff --git a/tools/gce/create_linux_performance_worker.sh b/tools/gce/create_linux_performance_worker.sh
index 9b85f7b..7f53732 100755
--- a/tools/gce/create_linux_performance_worker.sh
+++ b/tools/gce/create_linux_performance_worker.sh
@@ -34,7 +34,7 @@
     --zone "$ZONE" \
     --machine-type $MACHINE_TYPE \
     --image-project ubuntu-os-cloud \
-    --image-family ubuntu-1610 \
+    --image-family ubuntu-1704 \
     --boot-disk-size 300 \
     --scopes https://www.googleapis.com/auth/bigquery