RFR: 2228: Remove JbsBackports

[Erik Duveblad]

Hi all,

please review this patch that removes the class `JbsBackports`. The class `JbsBackports` was created because the `Backports` class in the `org.openjdk.skara.jbs` module did not have a way to create a backport via an `IssueTracker` instance. Thanks to 42cae169d it is now possible to create a backport using only an `IssueTracker` instance, so the creation of backports can now be moved to the `Backports` class where it belongs.

I also moved the integration test `JbsBackportIntegrationTests` to `BackportsIntegrationTests` and changed the properties to start with `jbs.*` instead of `jira.*` (because this about testing a JBS instance, not a general JIRA instance). I have run the the integration tests and they are passing.

Thanks,
Erik

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Commit messages:
 - 2228

Changes: https://git.openjdk.org/skara/pull/1632/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1632&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2228
  Stats: 284 lines in 7 files changed: 132 ins; 149 del; 3 mod
  Patch: https://git.openjdk.org/skara/pull/1632.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1632/head:pull/1632

PR: https://git.openjdk.org/skara/pull/1632