s3:smb2_server: allow logoff, close, unlock, cancel and echo on expired sessions

s3:smb2_server: allow logoff, close, unlock, cancel and echo on expired sessions

Windows client at least doesn't have code to replay
a SMB2 Close after getting NETWORK_SESSION_EXPIRED,
which locks out a the client and generates an endless
loop around NT_STATUS_SHARING_VIOLATION.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13197

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Dec 21 23:28:42 CET 2017 on sn-devel-144