RFR: 673: PR author should be able to use /reviewers command [v3]

[Erik Helin]

> Hi all,
> 
> please review this patch that allows pull request author's to issue the `/reviewers` command (sometimes the PR author
> knows ahead of time that it is a complicated to PR to review).
> Testing:
> - [x] `make test` passes on Linux x64
> - [x] Added one additional unit test
> 
> Thanks,
> Erik

Erik Helin has updated the pull request incrementally with one additional commit since the last revision:

  Simplify code based on reviewer feedback

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

Changes:
  - all: https://git.openjdk.java.net/skara/pull/820/files
  - new: https://git.openjdk.java.net/skara/pull/820/files/347594f0..7b177683

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=820&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=820&range=01-02

  Stats: 39 lines in 4 files changed: 0 ins; 23 del; 16 mod
  Patch: https://git.openjdk.java.net/skara/pull/820.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/820/head:pull/820

PR: https://git.openjdk.java.net/skara/pull/820