Rework use of LIBGUESTFS_BACKEND to use direct
Rework use of LIBGUESTFS_BACKEND to use direct

Rework of repos task which should use LIBGUESTFS_BACKEND and not
LIBGUESTFS_BACKEND_SETTINGS. In all our cases direct should be
used.

Change-Id: I9636c3be8ed9d1a998646af8907695868c0e8dd3

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared