osd: be a bit more verbose on startup

load_pgs can take a while and it is nice to know what ceph-osd is doing
without cranking up logging.

Did a quick audit of dout(1)'s and making this the default.  This lets us
see basic OSD state changes (load_pgs, boot, active) at the default level.

At this point all osd state changes should be logged at level 1.

Signed-off-by: Sage Weil <sage@inktank.com>
OSD,config_opts: log osd state changes at level 0 instead

Signed-off-by: Samuel Just <sam.just@inktank.com>
Merge pull request #1355 from ceph/wip-osd-verbosity

osd: be a bit more verbose on startup

Reviewed-by: Samuel Just <sam.just@inktank.com>