RFR: 372: Tool support for small/minor/trivial "fast-track" changes.

[Robin Westberg]

Hi all,

Please review this change that adds the possibility of issuing an `/issue create` command. The title and the body of
the issue will be copied from the pull request. The command is only available for committers and above (who already
have access to creating issues manually).

Best regards,
Robin

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Commit messages:
 - Initial implementation of create subcommand to issue

Changes: https://git.openjdk.java.net/skara/pull/677/files
 Webrev: https://webrevs.openjdk.java.net/skara/677/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-372
  Stats: 673 lines in 14 files changed: 453 ins; 167 del; 53 mod
  Patch: https://git.openjdk.java.net/skara/pull/677.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/677/head:pull/677

PR: https://git.openjdk.java.net/skara/pull/677