p4fastimport: add --base option to define branchpoint
We are adding an option --base to define a starting point for a
new branch. We define --bookmark as the head of the branch (we
might introduce a --dest option in addition). This allows us to create
new branches for release branches and others.
Note that for some reason, arc unit is generating different test
results than running the run-test.py manually, causing branch updates in
different situations. Therefore we have to glob a bunch of tests.
python ../../hg-crew/tests/run-tests.py test-p4fastimport-* test-check*
Reviewers: #mercurial, quark
Reviewed By: quark
Subscribers: quark, medson, mjpieters
Differential Revision: https://phabricator.intern.facebook.com/D5769328