Fix tests on redis restart (#600)

previous pr had a typo causing issues on cluster

Author: gamefiend

bin/ghe-restore

@@ -647,7 +647,7 @@ if $instance_configured; then
   echo "nomad stop redis" |
     ghe-ssh "$GHE_HOSTNAME" -- /bin/sh 1>&3 2>&3
   ghe-ssh "$GHE_HOSTNAME" -- "/usr/local/share/enterprise/ghe-nomad-jobs queue /etc/nomad-jobs/redis/redis.hcl" 1>&3 2>&3
-  if $? -gt 0; then 
+  if [ "$?" -gt 0 ]; then 
     log_error "Unable to restart redis"
   fi
   log_info "Getting redis status after restart..." 1>&3