Merge branch 'master' into next

* master:
  Prepare 5.3.8-SNAPSHOT builds
  JGit v5.3.7.202002110540-r
  Prepare 5.1.14-SNAPSHOT builds
  JGit v5.1.13.202002110435-r
  reftable: don't check deadline on the first try
  reftable: clarify comment
  reftable: clear cache on full compaction
  reftable: remove outdated comment
  reftable: clarify that LogCursor may return a null ReflogEntry
  Use lambdas where possible
  Upgrade maven-pmd-plugin to 3.13.0
  Restore behavior of CloneCommand
  Include org.apache.commons.codec 1.13 in the JGit http.apache.feature
  Update Maven plugins
  AmazonS3: Speed up fetch, try recent packs first

Change-Id: I436eec8450b81db189b649c044a2eba828ccf68f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>