Added python wrapper to rados_cluster_stat

The new get_cluster_stats() method on the rados.Rados object calls
the rados_cluster_stat() function in the librados library.

Signed-off-by: Christopher Glass <christopher.glass@canonical.com>
Merge pull request #31 from chrisglass/expose_cluster_stats_to_python

Added python wrapper to rados_cluster_stat
config_opts.h: default osd_recovery_delay_start to 0

This setting was intended to prevent recovery from overwhelming peering traffic
by delaying the recovery_wq until osd_recovery_delay_start seconds after pgs
stop being added to it.  This should be less necessary now that recovery
messages are sent with strictly lower priority then peering messages.

Signed-off-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: Gregory Farnum <greg@inktank.com>
Merge git://github.com/ceph/ceph