Merge branch 'stable-3.2' into stable-3.3

* stable-3.2:
  Do not rely on System.nanoTime for E2E metrics
  Introduce the apply-objects REST-API for the whole '/meta' chain
  Fix the processing of an empty HTML response body from REST-API
  Fix issue with ref deletion and global-refdb
  Fix issue with fetching all refs after project creation
  Always fallback to fetch when ApplyObject REST-API fails
  Log the reason why a ref object wasn't loaded by RevisionReader
  Consider any HTTP 2xx response code from REST-API as success
  Return NO_CONTENT when removing a ref through ApplyObject
  Introduce E2E fetch REST-API metrics

Change-Id: I58f27ad1977921598e991b35360d016ec125fe13