Fixed remote DB installations

This patch fixes host resolution for MySQL/MariaDB remote installation.
Relevant Puppet providers have been moved to separate module because remote
installation for AMQP backend will be implemented in this module.
Initialization for MySQL/MariaDB client has been fixed, so it is now
working also with MariaDB client (RHEL-7+, Fedora-20+).

Change-Id: Ic9328562226ecceebff11f9021457d1338977e77
Fixes: rhbz#1128212