Write to /etc/ssh with super user privileges
Write to /etc/ssh with super user privileges

Not sure why it's working in CI or in the general case, but I've seen
this task fail with "Destination /etc/ssh not writable" from time to
time. This commit ensures it's always run with super user privilege so
it can write it /etc/ssh directory.

Change-Id: Ia753b5e842c20c21714111c6267ef70d53d9de4a

openstack/tripleo-common,openstack/tripleo-common