RFR: 680: Allow /csr command in PR body

[Erik Helin]

Hi all,

please review this patch that allows the `/csr` pull request command to be used in the PR body.

Testing:
- [x] `make test` passes
- [x] Added one addition

Thanks,
Erik

-------------

Commit messages:
 - 680

Changes: https://git.openjdk.java.net/skara/pull/822/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=822&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-680
  Stats: 39 lines in 2 files changed: 39 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/822.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/822/head:pull/822

PR: https://git.openjdk.java.net/skara/pull/822