Remove lib/cinder_backends/xiv
Remove lib/cinder_backends/xiv

Since support for sections was added to devstack local.conf parsing
we don't need this, and actually prefer just using the
sections in local.conf.

Change-Id: I5908fdf7ad127997bb1f4a6bbb16d0d8cf073ddd

dtroyer/devstack,dtroyer/devstack,bswartz/devstack,group-policy/devstack,bswartz/devstack,nawawi/openstack,openstack-dev/devstack,nawawi/openstack,noironetworks/devstack,openstack-dev/devstack,noironetworks/devstack,richliu/devstack,group-policy/devstack,richliu/devstack