RFR: 1588: Bridge messages should not be sent for PRs in draft state [v2]

[Guoxiong Li]

> Hi all,
> 
> This patch prevents the `mailling bridge bot` from sending emails when a PR is draft.
> And the related test case is added.
> 
> Thanks for taking the time to review.
> 
> Best Regards,
> -- Guoxiong

Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:

  Filter the comments in method ArchiveWorkItem#ignoreComment

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

Changes:
  - all: https://git.openjdk.org/skara/pull/1469/files
  - new: https://git.openjdk.org/skara/pull/1469/files/cdcfe380..11704271

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1469&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1469&range=00-01

  Stats: 137 lines in 11 files changed: 122 ins; 1 del; 14 mod
  Patch: https://git.openjdk.org/skara/pull/1469.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1469/head:pull/1469

PR: https://git.openjdk.org/skara/pull/1469