OpenSSH 7.7p1 interop failure with Twisted Conch 8.0.0-17.9.0

[Colin Watson]

This isn't an OpenSSH bug, but just in case anyone else is ambitious
enough to automatically run interoperability tests against other SSH
implementations, here's a heads-up:

  https://twistedmatrix.com/trac/ticket/9422

TL;DR: commit 7c856857607112a3dfe6414696bf4c7ab7fb0cb3 caused there to
be an SSH_MSG_DEBUG message sent where there wasn't one before, which
tripped over an implementation bug in Twisted.  I'm guessing slightly at
the affected version range based on git history.

-- 
Colin Watson                                       [cjwatson at debian.org]