mysql init.sls - change startup time from 2 min to 15min

Closes https://github.com/Security-Onion-Solutions/securityonion/issues/1106

salt/mysql/init.sls

@@ -89,7 +89,7 @@ so-mysql:
       - /opt/so/conf/mysql/etc
   cmd.run:
     - name: until nc -z {{ MAINIP }} 3306; do sleep 1; done
-    - timeout: 120
+    - timeout: 900
     - onchanges:
       - docker_container: so-mysql
-{% endif %}
+{% endif %}