[Rev 02] RFR: git-pr: support git pr create --draft

[Erik Helin]

> Hi all,
> 
> please review this patch adds support for `--draft` switch to `git pr create`.
> 
> Testing:
> - Manual testing of `git pr create`
> 
> Thanks,
> Erik

The pull request has been updated with a new target base due to a merge or a rebase.

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

Commits:
 - 33177e22: Merge master
 - 4d86006d: Support 'git pr set --no-draft'
 - c667d5a6: Support git pr create --draft

Changes: https://git.openjdk.java.net/skara/pull/454/files
 Webrev: https://webrevs.openjdk.java.net/skara/454/webrev.02
  Stats: 115 lines in 8 files changed: 114 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/454.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/454/head:pull/454

PR: https://git.openjdk.java.net/skara/pull/454