PostReview: Don't try to publish other users' drafts

We were calling the wrong PatchLineCommentsUtil method by accident,
getting all drafts on a change rather than just the current user's
drafts. Fortunately, there is a sanity check in ChangeDraftUpdate that
was triggering and turning these into 500s rather than actually
publishing other users' drafts.

Fix this bug, and add some more draft changes to the test case that
are explicitly excluded.

Change-Id: Ifae5b0a61328b33170664a81a39f02fa7cfd4e4e
2 files changed