tests: conditionalize out tests that msys is mangling
This was exposed by
ac0a87160012. The paths for convert and ssh respectively
are being turned into:
$TESTTMP\bzr+ssh:\foobar@selenic.com\baz\.hg
'C:\\C:\\Users\\Matt\\AppData\\Local\\Temp\\hgtests.8awa9x\\child1\\test-ssh-bundle1.t-sshv2\\nonexistent\\.hg
The errno value raised is 123, and the message is
The filename, directory name, or volume label syntax is incorrect
{header}
<title>Mercurial repository not found</title>
</head>
<body>
<h2>Mercurial repository not found</h2>
The specified repository "{repo|escape}" is unknown, sorry.
Please go back to the <a href="{url|urlescape}">main repository list page</a>.
{footer}