libceph: Convert pr_warning to pr_warn

Use the more common pr_warn.

Other miscellanea:

o Coalesce formats
o Realign arguments

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>

diff --cc net/ceph/ceph_common.c
Simple merge

diff --cc net/ceph/messenger.c
Simple merge

diff --cc net/ceph/mon_client.c
Simple merge

diff --cc net/ceph/osd_client.c
Simple merge

diff --cc net/ceph/osdmap.c
Simple merge