* Merge branch 'stable-5.10' into stable-5.11

* PackExt: Convert to Enum
* Restore preserved packs during missing object seeks

* LFS: handle invalid pointers better

* Don't export package from test bundle

* Do not fail if known hosts file does not contain valid host key

* Upgrade maven-pmd-plugin to 3.13.0

* Replace usage of ArrayIndexOutOfBoundsException in treewalk

* Call AdvertiseRefsHook before validating wants

* Merge branch 'stable-5.1'

* Merge branch 'stable-5.0'

* ObjectIdSerializer: Support serialization of known non-null ObjectId

* DfsBlockCache#creditSpace: release clockLock in finally block
* ArchiveTest: Check result of BufferedInputStream#skip
* FS_POSIX: Fix boxing/unboxing of Boolean
* Use constants from StandardCharsets instead of hard-coded strings
* LfsServerText: Fix formatting of invalidPathInfo message
* InvalidLongObjectIdException: Fix formatting of message
* Move repeated LFS Gson handling to common class
* DownloadTest: Use ExpectedException instead of try..catch..fail

* PushConnectionTest#limitCommandBytes: Increase maxCommandBytes

* Downgrade Jetty to 9.3.17.v20170317 in Bazel build

* Explain in error message how to recover from lock failure

* Prefer smaller GC files during DFS garbage collection
* Fix missing deltas near type boundaries

* Ignore trailing spaces in directory rule patterns

* ReceivePack: Catch InvalidObjectIdException instead of IAE
* UploadPack: Include peeled ObjectId as advertised

* MergeCommandTest: Use JUnit's assume to check preconditions
* MergeCommandTest: Open Git instances in try-with-resource

* NoteMapTest: Open TreeWalk instances in try-with-resource
* ObjectDirectoryTest: Fix warnings about variable hiding
* PackWriterTest: Open RevWalk in try-with-resource
* PatchIdDiffFormatterTest: Open Git and PatchIdDiffFormatter in try-with-resource
* PathSuffixFilterTest: Open TreeWalk in try-with-resource
* PostOrderTreeWalkTest: Open TreeWalk in try-with-resource
* PullCommandWithRebaseTest: Open RevWalk in try-with-resource
* PushCommandTest: Open Git instances in try-with-resource
* RacyGitTests: Open NameConflictTreeWalk in try-with-resource
* RecursiveMergerTest: Open TreeWalk and BufferedReader in try-with-resource
* ReflogConfigTest: refactor commit method to avoid variable hiding
* Update .mailmap
* RefDirectoryTest: Fix warning about member variable hiding
* ReflogResolveTest: Open Git instances in try-with-resource
* ReflogTest: Open Git instances in try-with-resource
* RepoCommandTest: Open Git instances in try-with-resource

* Accept UTF8 BOM with BlobBasedConfig

* Fix integer boxing eclipse warning

* PushCertificateParser: Move reader parsing to instance method
* PushCertificateParser: Make constructor public
* Report PackProtocolExceptions to client during receive-pack
* PushCertificate: implement hashCode/equals/toString
* PushCertificateParser: Make pushee optional
* PushCertificateParser: Change error string for invalid field
* PushCertificateParser: Add method for parsing from a stream
* IO: Add a method for reading lines
* BaseReceivePack: Treat all LFs as optional
* BaseReceivePack: More validation during parseCommand

* Deprecate TemporaryBuffer.LocalFile without parent directory
* Switch FileHeader.extractFileLines to TemporaryBuffer.Heap
* AmazonS3: Buffer pushed pack content under $GIT_DIR
* DirCache: Buffer TREE extension to $GIT_DIR

* Do not rewrite parents in RevWalkTextBuiltins
* RevWalk: Allow disabling parent rewriting
* RevWalkTextBuiltin: Add -n to limit number of commits returned

* Add MetaFilter.serveRegex(Pattern)
* Expand RegexPipeline documentation
* Add simple tests for RegexPipeline

* Sort translation bundle keys in alphabetical order.