Add /api/v1/bookie/info REST API

Descriptions of the changes in this PR:

This adds an additional HTTP REST endpoint to expose the bookie's info (only storage numbers for now).

### Motivation

I was looking for an HTTP endpoint that returned the info of only the current bookie, but couldn't find one. The only similar API I've found was `/api/v1/bookie/list_bookie_info`, however it connects to all bookies and may take a long time to respond (plus its response format is difficult to parse).

### Changes

I've added a new API at `/api/v1/bookie/info` that returns a response like:
```json
{
  "freeSpace" : 0,
  "totalSpace" : 0
}
```


Reviewers: Matteo Minardi <minardi.matteo@hotmail.it>, Enrico Olivelli <eolivelli@gmail.com>, Jia Zhai <zhaijia@apache.org>

This closes #2322 from fretiq/add-bookie-info-api
6 files changed
tree: 15ee245740a064f328471784c0dcd0b149796f73
  1. .github/
  2. .test-infra/
  3. bin/
  4. bookkeeper-benchmark/
  5. bookkeeper-common/
  6. bookkeeper-common-allocator/
  7. bookkeeper-dist/
  8. bookkeeper-http/
  9. bookkeeper-proto/
  10. bookkeeper-server/
  11. bookkeeper-stats/
  12. bookkeeper-stats-providers/
  13. buildtools/
  14. circe-checksum/
  15. conf/
  16. cpu-affinity/
  17. deploy/
  18. dev/
  19. docker/
  20. metadata-drivers/
  21. microbenchmarks/
  22. shaded/
  23. site/
  24. stats/
  25. stream/
  26. tests/
  27. tools/
  28. .gitignore
  29. LICENSE
  30. NOTICE
  31. pom.xml
  32. README.md
README.md

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