[PATCH v2 3/7] fix thread breakage via ghost-on-removal

[David Bremner]

Daniel Kahn Gillmor <dkg at fifthhorseman.net> writes:

> ghost-on-removal the solution to T590-thread-breakage.sh that just
> adds a ghost message after removing each message.

- this patch should remove the test_subtest_known_broken added by (my
  revised version of T590. Also, "curently broken" probably doesn't need
  to be in the description, since the individual test is marked.
- there's a few lines with whitespace on the end of line.