tests: pass str to matchoutput()
It accepts a str, not bytes.
This fixes a failure in test-hghave.t on Windows. Why it
wasn't failing on Linux, I don't know. I suspect the Windows
process code in Python doesn't accept bytes and the POSIX code
does?
Differential Revision: https://phab.mercurial-scm.org/D8334
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- Regex: '^<'
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