* Drop unaccepted (unapplying) coverity patches
* Drop server support for SSH1 (server)
* Workaround #2641 for systemd
* UseLogin is gone
* Drop upstream commit 28652bca
* Tighten seccomp filter (cache credentials before entering sandbox) (#1395288)
Failed with older clients, because server was doing signature over
different data than the verifying client. It was caused by bump of
minimal DH groups offered by server and a bug in code, which was
using max(client_min, server_min) instead of client_min as proposed
by RFC4462.
