objecter: logger

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
objecter: count number of in flight ops

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
objecter: op_cancel

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
atomic_t: add atomic64_t

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
objecter: use atomic64_t for last_tid

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
librados: push snap related functions down to objecter

Need to take appropriate lock.

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
librados: remove warning

Seems that the current locking scheme is ok. Objecter handles its
locking internally, librados needs to hold its lock.

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>