Concatenate reference config files in singlejar

Merge reference.conf files in single jar since [akka will break](https://doc.akka.io/docs/akka/current/general/configuration.html#when-using-jarjar-onejar-assembly-or-any-jar-bundler) if reference.conf files are overwritten.
The feature is added to both java and cpp implementations of singlejar to concatenate reference.conf files to keep behaviors consistent. For the cpp implementation, using `OutputJar.ExtraCombiner` in singlejar_main.cc feels less intrusive than adding a new `Concatenator` in the output_jar code.

Bazel-dev discussion on the issue is [here](https://groups.google.com/forum/#!topic/bazel-dev/C30dwAPL708).

Closes #4413.

PiperOrigin-RevId: 181622277
3 files changed
tree: 9018c2f02f6477552379cd6174072f694d361120
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
README.md

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