Merge pull request #7254 from nicolasnoble/gcloud-no-image-aliases

Stop using image aliases, as this is getting deprecated.

tools/gce/create_linux_worker.sh

@@ -43,7 +43,8 @@ gcloud compute instances create $INSTANCE_NAME \
     --project="$CLOUD_PROJECT" \
     --zone "$ZONE" \
     --machine-type n1-standard-8 \
-    --image ubuntu-15-10 \
+    --image-family=ubuntu-1510 \
+    --image-project=ubuntu-os-cloud \
     --boot-disk-size 1000
 
 echo 'Created GCE instance, waiting 60 seconds for it to come online.'