use 'mon create-initial' always

But don't error if it fails, as this would mean that the monitors
are just taking longer to form quorum. Go and try the next block which will
wait up to 15 minutes for a successful gatherkeys to happen (that only works
if monitors have formed quorum).

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
Merge pull request #103 from ceph/9172

use 'mon create-initial' always