CIFS: Cleanup cifs open codepath

Rename CIFSSMBOpen to CIFS_open and make it take
cifs_open_parms structure as a parm.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>

Conflicts:
	fs/cifs/cifsproto.h
	fs/cifs/cifssmb.c