ctdb-recoverd: Periodically log recovery master of incomplete cluster

ctdb-recoverd: Periodically log recovery master of incomplete cluster

Only do this if the recovery lock is unset.  Log every minute for the
first 10 minutes, then every 10 minutes, then every hour.

This is useful for determining whether a split brain occurred.  It is
particularly useful if logging failed or was throttled at startup, so
there is no evidence of the split brain when it began.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>