s4/torture: port SMBv1 RAW-LOCK tests to SMBv2

[tridge at samba.org]

Hi Steven,

 > It's a standalone server, not a DC, and signing was disabled.

You can run with signing against a server that doesn't do signing by
default by adding "--signing=required" to the smbtorture command line.

I've checked against win7 as well, and it also gives a signing error
for the SMB2-LOCK test. I think this might be worth investigating.

Cheers, Tridge