s3: Fix bug 8334, do not fork the echo handler for smb2

s3: Fix bug 8334, do not fork the echo handler for smb2

If a smb1 negprot negotiated smb2 we forked the echo responder. This will
eventually lead to a panic from

[2011/08/30 10:33:29.212578,  0, pid=3846917] smbd/smb2_server.c:243(smbd_smb2_request_create)
  Invalid SMB packet: first request: 0x0009

because from the echo responder we always read using the normal smb1 protocol
handling routine. If that is a bit down the smb2 stream, we get a non-negprot
packet and panic.

BTW, the echo responder is not required for smb2 anyway, Microsoft confirmed
that it probes the server liveness using TCP keepalives and not smb2 echo
requests.

Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Wed Aug 31 17:58:48 CEST 2011 on sn-devel-104