test: unquiet few tests to demonstrate changes in upcoming patches
Upcoming patches will skip revlog cloning for share-safe upgrades.
Differential Revision: https://phab.mercurial-scm.org/D9773
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# Avoid interference from actual test env:
unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL