(PDB-457) Storconfigs acceptance tests broken on Fedora

Fedora 20 ships with a newer version of activerecord that removes the
verify_active_connections! method and breaks testing. This commit uses
gems (rather than the Fedora RPM) to get a supported version of activerecord
Merge pull request #930 from senior/maint/master/fedora-20-issue

(PDB-457) Storconfigs acceptance tests broken on Fedora