RFR: 216: git-pr: show response to test and integrate commands

[Erik Helin]

Hi all,

please review this patch that adds support for showing feedback after a user has
issued the `git pr integrate` or `git pr test` commands.

Thanks,
Erik

## Testing
- [x] Manually tested `git pr test` and verified output

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

Commits:
 - 841350cd: skara-216

Changes: https://git.openjdk.java.net/skara/pull/348/files
 Webrev: https://webrevs.openjdk.java.net/skara/348/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-216
  Stats: 83 lines in 1 file changed: 75 ins; 5 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/348.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/348/head:pull/348

PR: https://git.openjdk.java.net/skara/pull/348