mon: Monitor: health to clog writes every X seconds on the second

mon: Monitor: health to clog writes every X seconds on the second

3600 will mean every hour, on the hour; 60 will mean every minute, on
the minute.  This will allow the monitors to spit out the info at
regular intervals, regardless the time at which they formed quorum or
which monitor is now the leader.

Signed-off-by: Joao Eduardo Luis <joao@redhat.com>