Fix backup test, install bzip2.
Try to add some checks so the test doesn't do an rm -rf /
MariaDB still uses my.cnf as the main config file.
Fix to install ruby-mysql from gem.
Change package/service for MariaDB.
Allow the tests to run on RHEL7.
Merge pull request #511 from mhaskel/rhel7-fixes

Rhel7 fixes