Fix sign mount option and sign proc config setting

Fix sign mount option and sign proc config setting

Patch mainline: 2.6.23-rc1

Backported the fix (2.6.23-rc1) from Steve French. The original patch removes
few commented functions (which are not required) as part of this fix, backport
also does the same to retain compatibility.

We were checking the wrong (old) global variable to determine
whether to override server and force signing on the SMB
connection.

Acked-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>