s4:torture: Produce more output to help debug smb2.multichannel.bugs.bug_15346

s4:torture: Produce more output to help debug smb2.multichannel.bugs.bug_15346

Print the time (as reckoned by tevent) at which each ‘negprot done’ and
‘echo done’ message is produced, and print another message if one of the
requests times out.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15498

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Tue Oct 24 15:51:40 UTC 2023 on atb-devel-224