bundleoperation: optionnaly record the `remote` that produced the bundle
We have the information at hand, and the peer now have knownledge of its `path` object, which constaints useful behavior configuration.
So the simpler seems to be to pass that object around so it can be used if
needed.
#
# Avoid interference from actual test env:
unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL