Add a simple dummy ssh test
This uses the -e flag to run a dummy script rather than actual ssh to
test the protocol over a local pipe.
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<title>Mercurial repositories index</title>
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<h2>Mercurial Repositories</h2>
<table>
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<td>Name</td>
<td>Description</td>
<td>Contact</td>
<td>Last change</td>
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