Bug#807107: ssh: doesn't support SSH protocol version 1

[Evgeny Kapun <abacabadabacaba@gmail.com>]

Package: openssh-client
Version: 1:7.1p1-1

After the last update, ssh can't use SSH protocol version 1. Moreover, if "Protocol 1" option appears anywhere in ssh_config file, ssh will not work at all.

Unfortunately, there are still SSH servers which don't support protocol version 2. Unfortunately, people who use these servers usually don't have administrative access so they can't upgrade them. I understand why support for such an old protocol is disabled by default, but why remove it completely? As a result, people who need to access these older servers will have to use alternative builds or even build SSH client manually.

How to reproduce:
$ ssh 217.112.42.93
Protocol major versions differ: 2 vs. 1
$ ssh -1 217.112.42.93
ssh1 is not supported