[WIP] Avoid harmful restart of services in master and slave recipes

Avoid harmful restarting services in master and slave recipes stated in #18.

`mesos-[master|slave]` will be (re)started when
* initial installation of mesos, or
* `mesos-[master|slave]-env.sh has been changed.
  * _even if user choose installation type 'mesosphere', this recipe creates the file for `mesos-[start|stop]-cluster.sh` script._
I'm not clear on why we need reload and restart here?  Is one for the upstart conf and the other for restarting the actual service?