RFR: git-pr-test: add flags --job and --approve

[Erik Helin]

Hi all,

please review this patch that adds the `--job` and `--approve` flags to `git pr test`.

Thanks,
Erik

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Commit messages:
 - git-pr-test: add flags --job and --approve

Changes: https://git.openjdk.java.net/skara/pull/790/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=790&range=00
  Stats: 18 lines in 1 file changed: 16 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/790.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/790/head:pull/790

PR: https://git.openjdk.java.net/skara/pull/790