[PATCH] cifs: Gracefully turn off serverino (when serverino is enabled on mount)

Old servers such as NT4 do not support this level of FindFirst (and
retry with a lower infolevel)

Signed-off-by: Steve French <(sfrench@us.ibm.com)>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>