Use API exposed by gerritchangequery-plugin

The gerritchangequery-plugin for Jenkins makes job runs working on
a given patchset queryable. This makes searching for jobs relevant
to the checks-API much more efficient.

[1] https://review.gerrithub.io/admin/repos/tdraebing/gerritchangequery-plugin,general

Change-Id: I96906668be85e998f9a2aedcd5e87531f393d966
4 files changed
tree: e21fa66fb1ffe9149480856e275b920102c9da3e
  1. src/
  2. web/
  3. BUILD
  4. LICENSE