stop cron before soup upgrades the manager, start cron at the end. add cron state that is in included in common

salt/common/tools/sbin/so-common

@@ -360,6 +360,13 @@ run_check_net_err() {
 		exit $exit_code
 	fi
 }
+set_cron_service_name() {
+  if [[ "$OS" == "centos" ]]; then
+    cron_service_name="crond"
+  else
+    cron_service_name="cron"
+  fi
+}
 
 set_os() {
 	if [ -f /etc/redhat-release ]; then