mon: Monitor: s/get_status()/get_cluster_status()/

Monitor::get_status() is actually used to obtain 'cluster status' (i.e.,
status about *all* the monitors, maps, IO, overall healthiness).

Just make that clear in the function name, avoiding confusion between
multiple 'status-related' functions in the monitor.

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
mon: Monitor: s/_mon_status()/get_mon_status()/

'Monitor::_mon_status()' provides status specific to the monitor being
poked.  This is information that does not necessarily relate with
cluster status, and can even be obtained when there's no quorum (via the
admin socket).

We change the function name to make the distinction between mon-specific
status and cluster-status, which is obtained via a different function.

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
Merge pull request #1526 from ceph/wip-status-function-names

mon: Monitor: change 'status' function names for clarity's sake

Reviewed-by: Sage Weil <sage@inktank.com>