ssh: fix flakey ssh errors on BSD systems
This is a trivial backport of c037fd655b47 performed by
augie@google.com, but the change is still really Durham's not mine, so
I [augie] am leaving him as the author.
#require docutils gettext
$ $TESTDIR/check-gendoc de
checking for parse errors
Die Dateien werden dem Projektarchiv beim n\xc3\xa4chsten \xc3\x9cbernehmen (commit) hinzugef\xc3\xbcgt. Um dies vorher r\xc3\xbcckg\xc3\xa4ngig zu machen, siehe:hg:`forget`. (esc)
warning: please have a space before :hg: