test-archive: silence stupid messages from GNU tar
Recent versions of GNU tar have apparently decided they're old enough
that it's ok for them to prattle on senselessly about things no one
cares about without anyone objecting. We object; apply duct tape.
adding a
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
% should issue warning
adding a
created new head
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
% should not issue warning
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
marked working directory as branch testing
% should not issue warning