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
so @claco stops complaining
Merge pull request #117 from rackerjoe/master

change the fedore epel key download location to something more stable
go nuclear on the yum cache
Merge pull request #118 from rackerjoe/master

go nuclear on the yum cache
New script cleanup-deployment.sh

Script to safely delete nova instances and quantum networks from the
jenkins build cluster.
Merge pull request #114 from invsblduck/add_safe_delete

New script cleanup-deployment.sh looks good to me
force config drive on gate tests