Fix gerrit ssh command.

Add back a missing space which we accidentally removed in 932bfca.

This should fix issues causing zero results to display.

Change-Id: I86ae8a7217862811438dc15282415f47bf09bfb0
Reviewed-on: https://review.openstack.org/25545
Approved: Dan Prince <dprince@redhat.com>
Reviewed-by: Dan Prince <dprince@redhat.com>
Tested-by: Jenkins