remote: made CombinedCache a composition of Disk and Http Cache

Fixes #8052

The problem: CombinedCache is not working.
The cause: both `OnDiskBlobStore` and `HttpBlobStore` store action results differently from other actions, but not in the same way. The `OnDiskBlobStore` appends "ac_" prefix to the key, while the `HttpBlobStore` stores it in a different directory. Current implementation added "ac_" prefix for both blob stores, which is not correct for the `HttpBlobStore`.
The solution: treat actionResults' `gets` and `puts` in accordance with a particular Blob Store used.

The problem is described in #8052 and the root cause is described in [this](https://github.com/bazelbuild/bazel/issues/8052#issuecomment-483556888) and [this](https://github.com/bazelbuild/bazel/issues/8052#issuecomment-487068204) comments.

Closes #8141.

PiperOrigin-RevId: 247387377
12 files changed
tree: da9bb5cae42fdce4554370276881cd5776689b59
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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