* Merge branch 'stable-5.0' into stable-5.1

* Merge branch 'stable-5.1' into stable-5.2

* pgm: Fix missing braces in Push.run()
* pgm: Handle exceptions in Push command
* pgm: Fix missing braces in MergeBase.run()
* pgm: Handle IOException in MergeBase command
* pgm: Fix missing braces in Merge command
* pgm: Handle exceptions in Merge command
* pgm: Fix missing braces in LsTree.run()
* pgm: Handle exceptions in LsTree command
* pgm: Fix missing braces in LsRemote.run()
* pgm: Handle exceptions in LsRemote command
* pgm: Handle exceptions in LsFiles command
* pgm: Fix missing braces in Log.run()
* pgm: Handle exceptions in Log command
* pgm: Handle exceptions in Init command
* pgm: Handle IOException in IndexPack command
* pgm: Fix missing braces in Fetch.run()
* pgm: Handle IOException in Fetch command
* pgm: Handle GitAPIException in Gc command
* pgm: Fix missing braces in DiffTree.run()
* pgm: Handle exceptions in DiffTree command

* Update list of committers
* Add new ssh bundles to Maven central scripts
* Update maven site reports

* Apache MINA sshd client: don't leak upstream classes and interfaces

* Prepare 4.9.8-SNAPSHOT builds

* DfsFsck: Check that .gitmodules in the repository have valid contents
* FsckError.CorruptObject: Use @Nullable constructor for errorType
* SubmoduleValidator: Always throw SubmoduleValidationException

* Merge branch 'stable-5.0'

* Do authentication re-tries on HTTP POST

* Silence API error for new method added to abstract MergeStrategy

* Enable and fix 'Should be tagged with @Override' warning

* Align include.path max depth with native git

* Remove AutoCloseable from internal PackFile and friends

* Add missing break

* Untracked files should not be included in stash

* Add tests for FileUtils.delete and EMPTY_DIREECTORIES_ONLY

* Fix the javadoc for GC.setExpire

* Compare repository format version as parsed long

* Fix a typo referring to RevFilter as RefFilter
* Execute ReceiveCommands via a method rather than in ReceivePack
* Modify refs in UploadPack/ReceivePack using a hook interface
* Remove PreUploadHook.onPreAdvertiseRefs
* Add an AdvertiseRefsHookChain, similar to the other hook chains
* Allow creating ReceiveCommands with a specified type
* Expose an OutputStream from ReceivePack for sending client messages
* Minor javadoc wording fixes in ReceivePack
* Extract filterCommands as a static method on ReceiveCommand