Patch [0] left 2 variables for authentication one is
openstack_swift_auth and the other (inexistent) openstack_ceph_rgw_auth
for the ceph_rgw start_keystone task.
This patch leaves only openstack_ceph_rgw_auth.
Closes-Bug: #1769463
[0] 84ade4e149
Change-Id: I1cc522d91f8258f4ca23afc10a0a2a2b35c1ff68
Signed-off-by: Jorge Niedbalski <jorge.niedbalski@linaro.org>