[CIFS] /proc/fs/cifs debug code cleanup and new stats2

These changes to debug code and new stats are helpful in
debugging potential tcp performance/configuration problems under cifs.

Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --cc fs/cifs/cifs_debug.c
Simple merge

diff --cc fs/cifs/cifsglob.h
Simple merge

diff --cc fs/cifs/transport.c
Simple merge