ctdb-tests: Fix "setreclock" test

ctdb-tests: Fix "setreclock" test

1. Waiting for generation to change isn't enough.  It now changes
   early in recovery and reclock might not have been set on all nodes.
   So wait until recovery is complete before checking reclock.

2. Use onnode -p when setting reclock on all nodes.  That will cause
   it to be set quickly on all nodes, to avoid the situation where the
   recovery master is the late in the list and resets the reclock on
   earlier nodes back to the old value.  This shouldn't matter if (1)
   is done but it can't hurt.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Michael Adam <obnox@samba.org>