sshpeer: remove support for connecting to <0.9.1 servers (BC)
197d10e157ce made this change for the HTTP peer. Let's do the same
for the SSH peer.
Test output changes as expected. A redundant test has been dropped.
.. bc::
Support for connecting to Mercurial servers older than 0.9.1 has
been removed.
Differential Revision: https://phab.mercurial-scm.org/D2036
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