Use tendrl firewalld service files instead of referecing to port numbers

[mbukatov]

In firewalld setup tasks, we are referencing to port numbers to be opened (as described in Tendrl firewall settings wikipage). We should use firewalld service names for Tendrl components.

This was originally part of #49, but was pushed out to unblock the pull request with firewalld setup.

[mbukatov]

Tendrl doesn't directly own any of the ports we open on Gluster or Tendrl server, so we can't add them into tendrl firewalld service config without hiding the ports we open.

For this reason, I'm closing this as wont fix.