tests/helper-runtests.sh

mergeresult: add sort argument to getactions() method

This will be used in next patch.

Differential Revision: https://phab.mercurial-scm.org/D8878

#
# Avoid interference from actual test env:

unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL