[Rev 03] 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 1 additional commit.

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

Added commits:
 - acd7a317: Better helptext for git pr set --no-draft

Changes:
  - all: https://git.openjdk.java.net/skara/pull/454/files
  - new: https://git.openjdk.java.net/skara/pull/454/files/33177e22..acd7a317

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/454/webrev.03
 - incr: https://webrevs.openjdk.java.net/skara/454/webrev.02-03

  Stats: 1 line in 1 file changed: 0 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