tests/helper-runtests.sh

test: cleanly skip test-remotefilelog-datapack.py on policy that breaks it

That tests requires the pure module to be available.

Differential Revision: https://phab.mercurial-scm.org/D8245

#
# Avoid interference from actual test env:

unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL