ceph: Set 10s timeout when connecting for help descriptions.

Signed-off-by: Dan Mick <dan.mick@inktank.com>
librados, rados.py: rados_create2: add clustername and future flags

rados.py also gets "conf_defaults" dict for things you might want to
default in your app differently before ceph.conf gets to them; currently
used for ceph CLI to be able to set log_to_stderr/err_to_stderr true,
among others.

Signed-off-by: Dan Mick <dan.mick@inktank.com>
ceph: collect/use clustername, and set defaults like other utilities

(defaults like log_to_stderr, err_to_stderr)

Signed-off-by: Dan Mick <dan.mick@inktank.com>
ceph: catch/handle exceptions in admin socket commands

Signed-off-by: Dan Mick <dan.mick@inktank.com>