test-patchbomb: use mocktime
The test was using system time for displaying ETAs, which could be flaky if
the sysload is high. This patch extracts mocktime.py from test-progress.t to
make sure test-patchbomb.t is unaffected by system time.
Differential Revision: https://phab.mercurial-scm.org/D844
Mercurial
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