When creating foreign stubs during SVN import, mark them imported
Summary: See <https://github.com/facebook/phabricator/issues/501>. I think the issue here is that we created a foreign stub for commit `X-1`, probably because commit `X` was created by running `svn cp y x`.
Test Plan: I'll write a separate test for this before I land it. Huge pain to test.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Differential Revision: https://secure.phabricator.com/D8133
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