* Prepare 5.1.7-SNAPSHOT builds

* FS_POSIX: Externalize log message

* pgm: Fix missing braces in Describe.run()
* pgm: Handle exceptions in Describe command
* pgm: Handle exceptions in Config command
* pgm: Fix too wide lines in Commit.run()
* pgm: Fix missing braces in Commit.run()
* pgm: Handle exceptions in Commit command
* pgm: Handle exceptions in Clean command
* pgm: Handle GitAPIException in Fetch command

* Apache MINA sshd client: respect NumberOfPasswordPrompts

* Merge branch 'stable-5.1'

* [spotBugs] Fix potential NPE in SmudgeFilter#downloadLfsResource

* Update apache httpcore and httpclient

* DfsInserter#openStream: Suppress resource warning about DfsReader
* CloneCommand: Suppress resource warning about Repository
* Rename RecursiveMergerTest and ResolveMergerTest to reduce confusion
* ResolveMergerTest: Use @DataPoints instead of @DataPoint
* SubmoduleSyncCommand: Refactor to open Repository in try-with-resource
* SubmoduleUpdateCommand: Refactor to open Repository in try-with-resource
* TransportGitAnon: Suppress resource warning about Socket
* FS#runProcess: Fix OutputStream left unclosed after IOException

* WorkingTreeIterator#idSubmodule: Refactor to open Repository in try-with-resource
* UploadPack: Suppress resource warning about PackWriter
* ShowPackDelta: Refactor to use try-with-resource
* SubmoduleWalk#forIndex: Suppress resource warning and update Javadoc
* SubmoduleWalk: Open Repository in try-with-resource
* RepositoryFilter: Refactor doFilter to open Repository in try-with-resource

* RefDirectory: Open BufferedReader in try-with-resource

* JGit v4.5.4.201711221230-r

* Merge branch 'stable-4.6'

* ReceivePack: report protocol parsing failures on channel 3
* ReceivePack: catch InvalidObjectIdException while parsing shallow
* ReceivePack: remove unnecessary try-catch around parseCommand
* ReceivePack: enable capabilities immediately on first line

* branch command: provide convenient and meaningful options help
* Simplify pgm tests: allow varargs and trim output for toString()
* Fixed few locale dependent pgm tests

* Fix InterruptTimer leak in BasePackConnection

* Introduce FS.execute() to execute a command defined by a ProcessBuilder
* Add an attribute accessor to CanonicalTreeParser and use it in Treewalk
* Adds the git attributes computation on the treewalk

* Consider original file mode while checking parent ignore rules

* DfsInserter: buffer up to streamFileThreshold from InputStream

* JGit v2.3.1.201302201838-r

* Fix compatibilty breakage for SystemReader