tests: Run pull tests for bare/bare-user

tests: Run pull tests for bare/bare-user

We have variants of `test-basic` for all 4 modes, but not for pull-test, which
for some reason was named `pull-archive`, but mostly pulls *into* bare repos.
The test code was structured like the basic one where it called into a
`pull-test.sh`, so let's actually use it for 2/3 bare modes. (I tried to extend
it to `bare-user-only` but it failed, going to look at that after this).

This is related to https://github.com/ostreedev/ostree/issues/991

Closes: #998
Approved by: jlebon