Add releasestatus SSH key

Add an SSH keypair for releasestatus so that it can connect to
review.openstack.org to grab review data. Also add review.o.o
public key to known_hosts.

The data in hiera was already added.

Change-Id: I193dfad5b229a0c193ce35d5a8917b0b3b86c117
Reviewed-on: https://review.openstack.org/30881
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins