mysqlbackup.sh should be able to find mysql

anywhere. This should enable use to use mysql::server::backup
idependantly, even if mysql is preinstalled, and preinstalled in non
standard locations
Modified params.pp to work on latest Red Hat releases

On Fedora-20+ and RHEL-7+ mysqld service does not work any more
and has been replaced by mariadb service. This patch changes all
parameters accordingly.
Merge pull request #429 from paramite/f20-mariadb

Change also service_name for Fedora
Merge pull request #457 from igalic/independent-backup

mysqlbackup.sh should be able to find mysql