cmdutil: mark dirstateguard as deprecated
I sincerely doubt this is used in external code, as grepping the
extensions I keep locally (including Facebook's hgexperimental and
evolve) indicate nobody outside of core uses this. As such, I'd also
welcome just dropping this name forward entirely.
#
# Avoid interference from actual test env:
unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL