change ssh username from Administrator to administrator to workaround username bug in copssh

Change-Id: I69e5256e2f95ea89413874c04d302b70a9f34797
Reviewed-on: http://review.couchbase.org/41663
Reviewed-by: Venu Uppalapati <venumahesh@gmail.com>
Tested-by: Venu Uppalapati <venumahesh@gmail.com>