Changeset 1151 in tailor for vcpx/darcs.py

Skip CVS revision on the wrong branch
CVS has a bug with the rlog command when using -r:branch syntax,
which leads to changesets on the wrong branch being listed in the
log. This would lead to a "Something went wrong: unable to determine
the exact upstream revision of the checked out tree" error, since the
date of the incorrect revision was much earlier than the date of the
branch.