RFR: Replace ContinuousIntegration.query with ContinuousIntegration.jobsFor

[Erik Helin]

Hi all,

please review this small pull request that narrows the scope of `ContinuousIntegration.query(String s)` to what is really is used for - `ContinuousIntegration.jobsFor(PullRequest pr)`.

Thanks,
Erik

## Testing
- [x] `make test` on Linux x64
- [x] `make images`

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Commits:
 - 710372a5: Replace ContinuousIntegration.query with ContinuousIntegration.jobsFor

Changes: https://git.openjdk.java.net/skara/pull/284/files
 Webrev: https://webrevs.openjdk.java.net/skara/284/webrev.00
  Stats: 11 lines in 5 files changed: 5 ins; 3 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/284.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/284/head:pull/284

PR: https://git.openjdk.java.net/skara/pull/284