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test: redirect stderr so warning messages don't change output (issue6237)

Authored by jcristau.

Description

test: redirect stderr so warning messages don't change output (issue6237)

clone and commit race for the lock, and if commit has to wait more than
a second it prints a warning to stderr. Since this is somewhat expected
here, silence it.

Differential Revision: https://phab.mercurial-scm.org/D8664