Merge pull request #115 from rackerjoe/master

fix ovs install and add unmount func
Switch to breu's unmount_filesystem
Temporarily disable Cinder secure delete for snaps

Workaround for LVM on CentOS 6.4.
See:
    https://bugzilla.redhat.com/show_bug.cgi?id=975052
    https://bugs.launchpad.net/cinder/+bug/1191812
    https://review.openstack.org/#/c/45114
    https://review.openstack.org/#/c/45117
Merge pull request #116 from invsblduck/lvm_volume_clear_workaround

Temporarily disable Cinder secure delete for snaps
update json for spc
change the fedore epel key download location to something more stable