RFR: 214: Improve the message given when a change can be integrated

[Robin Westberg]

Hi all,

This change adjusts the "this change is now ready to be integrated" message. After the change, it would look something like the below. Comments are welcome!

@rwestberg This change now passes all automated pre-integration checks. When the change also fulfills all [project specific requirements](https://github.com/openjdk/skara/blob/master/CONTRIBUTING.md), type `/integrate` in a new comment to proceed. After integration, the commit message will be:
No need for locking when using TestHostedRepository

Reviewed-by: ehelin
- If you would like to add a summary, use the `/summary` command.
- To credit additional contributors, use the `/contributor` command.
- To add additional solved issues, use the `/solves` command.

Since the source branch of this PR was last updated there have been 61 commits pushed to the `master` branch. As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to do this manually, please merge `master` into your branch first.

➡️ To integrate this PR with the above commit message, type `/integrate` in a new comment.

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Commits:
 - 91d414c3: Adjust the message

Changes: https://git.openjdk.java.net/skara/pull/343/files
 Webrev: https://webrevs.openjdk.java.net/skara/343/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-214
  Stats: 19 lines in 1 file changed: 7 ins; 5 del; 7 mod
  Patch: https://git.openjdk.java.net/skara/pull/343.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/343/head:pull/343

PR: https://git.openjdk.java.net/skara/pull/343