Coopr 589:Document SSL/TLS usage for coopr-standalone

@jwang47, @wolf31o2  please review
Here's the problem. The provisioner, itself, should **only** ever read from its own configuration file. There should be configuration options in the `provisioner-site.xml` for this. For standalone, we should modify the standalone-specific `provisioner-site.xml` located at `coopr-standalone/provisioner/master/conf/provisioner-site.xml` with some placeholder variables and sed them, like we do for the `provisioner.data.dir` and `provisioner.work.dir` properties.