[Rev 01] RFR: git-jcheck: add pre-push support

[Erik Helin]

> Hi all,
> 
> please review this patch that adds support for the `--pre-push` and
> `--setup-pre-push-hook` to `git-jcheck`. Setting up a pre-push hook can
> beneficial for OpenJDK projects where contributors push directly (where they
> don't use `git-pr` and pull requests).
> 
> Testing:
> - Manual testing on Linux x64
> 
> Thanks,
> Erik

The pull request has been updated with 1 additional commit.

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

Added commits:
 - c0c0789d: Use consistent spelling of pre-push

Changes:
  - all: https://git.openjdk.java.net/skara/pull/470/files
  - new: https://git.openjdk.java.net/skara/pull/470/files/87dd7851..c0c0789d

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/470/webrev.01
 - incr: https://webrevs.openjdk.java.net/skara/470/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/470.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/470/head:pull/470

PR: https://git.openjdk.java.net/skara/pull/470