Merge branch 'master' into stable-7.1

Merge branch 'master' into stable-7.1

* master:
  PackDirectory: Filter out tmp GC pack files
  Add pack-refs command to the CLI
  Test advertised capabilities with protocol V0 and allow*Sha1InWant
  Align request policies with CGit
  GitTimeParser: Fix multiple errorprone and style comments
  PersonIdent: Preserve the timezone when copying with new time
  PersonIdent: Revert @since of #getZoneId
  tests/BasicTest: Use java.time constructors for PersonIdent
  RawParseUtils test: Use java.time to create PersonIdents
  Change default similarity score to 50(%) to match git's default
  Pack.java: Recover more often in Pack.copyAsIs2()

Change-Id: I1386addb355ffba09dcbf1a6e8634d605c0d3b5c