GFS2: Use pr_<level> more consistently

Add pr_fmt, remove embedded "GFS2: " prefixes.
This now consistently emits lower case "gfs2: " for each message.

Other miscellanea around these changes:

o Add missing newlines
o Coalesce formats
o Realign arguments

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --cc fs/gfs2/dir.c
Simple merge

diff --cc fs/gfs2/glock.c
Simple merge

diff --cc fs/gfs2/lock_dlm.c
Simple merge

diff --cc fs/gfs2/main.c
Simple merge

diff --cc fs/gfs2/ops_fstype.c
Simple merge

diff --cc fs/gfs2/quota.c
Simple merge

diff --cc fs/gfs2/rgrp.c
Simple merge

diff --cc fs/gfs2/super.c
Simple merge

diff --cc fs/gfs2/sys.c
Simple merge

diff --cc fs/gfs2/trans.c
Simple merge

diff --cc fs/gfs2/util.c
Simple merge

diff --cc fs/gfs2/util.h
Simple merge