RFR: 1258: Add review link/details to comments section

[Guoxiong Li]

Hi all,

This patch adds a comment to the jira issue when the corresponding PR is submitted. Because currently, the class `Issue` has no an api to remove a comment. So I need to create and implement it, too. And the test cases are added.

Thanks for taking the time to review.

Best Regards,
-- Guoxiong

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Commit messages:
 - 1258: Add review link/details to comments section

Changes: https://git.openjdk.java.net/skara/pull/1250/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1250&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1258
  Stats: 138 lines in 9 files changed: 113 ins; 6 del; 19 mod
  Patch: https://git.openjdk.java.net/skara/pull/1250.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1250/head:pull/1250

PR: https://git.openjdk.java.net/skara/pull/1250