* ReceivePack: enable overriding filterCommands and executeCommands
* Replace ExpectedException which was deprecated in junit 4.13
* Add org.assertj 3.14.0.v20200120-1926 to target platform
* Replace deprecated junit assertion methods with hamcrest
* Update to Orbit I20200120214610 and JUnit to 4.13
* UploadPack: Filter refs used for want-ref resolution
* UploadPack: Defer want-ref resolution to after parsing
* Merge branch 'stable-5.0' into stable-5.1
* [findBugs] PackWriter.NONE should be final
* [findBugs] Remove reliance on default encoding in Base64
* [findBugs] Fix potential NPE in CleanFilter
* [findBugs] Fix potential NPE in ObjectDirectoryTest
* [findBugs] Fix potential NPE in GcPackRefsTest
* [findBugs] Fix potential NPE in GC
* [findBugs] Fix potential NPE in DirCacheCheckoutTest
* Don't use deprecated LockFile constructor
* Fix warnings about unchecked conversion of MergeResult
* MockServletConfig: Fix warning about unchecked conversion of Enumeration
* HugeFileTest: Make Git a class member and open in try-with-resource
* Suppress "unchecked cast" warnings related to UploadPackFactory.DISABLED
* DiffAlgorithms: Fix warnings about variable hiding
* DirCacheBasicTest: Open ObjectInserter.Formatter in try-with-resource
* DirCacheBuilderIteratorTest: Open TreeWalk in try-with-resource
* DirCacheCGitCompatabilityTest: Open TreeWalk in try-with-resource
* DirCacheCheckoutMaliciousPathTest: Open Git and RevWalk in t-w-r
* DirCacheIteratorTest: Open TreeWalk instances in try-with-resource
* ForPathTest: Open TreeWalk in try-with-resource
* GitConstructionTest: Open Git instance in try-with-resource
* IndexDiffTest: Open Git instances in try-with-resources
* ManifestParserTest: Don't use deprecated StringBufferInputStream
* InMemoryRepository: Remove unused RevWalk from batch method signature
* SignedPushConfig: Allow setting a custom nonce generator impl
* PackCertificateParser: return null if nothing was received
* Include push certificates in RefUpdate
* Remove redundant @since tags in new signed push classes
* Remove cached_packs support in favor of bitmaps
* Remove objects before optimization from DfsGarbageCollector
* Simplfy caching of DfsPackDescription from PackWriter.Statistics