* Merge branch 'stable-5.8'

* Merge branch 'master' into next

* ReftableTest: Clean up boxing warnings on usage of String.format
* MergedReftable: Remove unnecessary semicolon

* [pgm] Add --mirror option to clone command
* Remove meaningless comment in CloneCommandTest
* Implement mirror option in CloneCommand

* JschConfigSessionFactory: [findbugs] Set synchronized

* Apache MINA sshd: make sendKexInit() work also for re-keying

* Prepare 4.11.5-SNAPSHOT builds
* JGit v4.11.4.201810060650-r
* Merge branch 'stable-4.10' into stable-4.11

* FileRepositoryBuilderTest: Don't explicitly close BufferedWriter in try-with-resource
* Explicitly specify charset when constructing FileWriter
* Explicitly specify charset when constructing BufferedReader
* Explicitly specify charset in constructor of InputStreamReader
* Explicitly specify charset when calling getBytes
* Explicitly specify charset in constructor of String
* Make inner classes static where possible
* Bazel: Increase severity of ExpectedExceptionChecker to ERROR

* Add EMPTY_TREE_ID as a sibling of EMPTY_BLOB_ID
* Update javadoc for EMPTY_BLOB_ID

* Validate branch names on branch creation

* Teach UploadPack "filter" in protocol v2 fetch
* Refactor test of capabilities output
* Refactor v2 advertisement into own function
* Refactor parsing of "filter" into its own method
* Disallow unknown args to "fetch" in protocol v2
* Teach UploadPack shallow fetch in protocol v2
* Refactor unshallowCommits to local variable
* Add protocol v2 support in http
* Give info/refs services more control over response

* Test commit with huge commit message

* Consistently use Constants.CHARSET rather than StandardCharsets.UTF_8
* Constants: Initialize CHARSET and CHARACTER_ENCODING from StandardCharsets.UTF_8

* Remove deprecated StreamCopyThread#flush
* Remove deprecated SafeBufferedOutputStream
* Remove deprecated EolCanonicalizingInputStream
* Remove deprecated FileUtils#relativize(String, String)
* Remove deprecated FileUtil using Java 7 NIO

* TransportCommand#setTimeout: Specify units for timeout in Javadoc

* Merge branch 'stable-4.6'

* TreeWalkJava7Test: Open TreeWalk in try-with-resource

* ConcurrentRepackTest: Don't use deprecated WindowCache.reconfigure
* ConcurrentRepackTest: Open RevWalk in try-with-resource
* CommitOnlyTest: Open RevWalk in try-with-resource
* UnpackedObjectTest: Create ObjectInserter.Formatter in try-with-resource
* FileRepositoryBuilderTest: Use try-with-resource for auto-closeables
* RepositorySetupWorkDirTest: Fix "resource leak" warnings

* Fix imports in BundleWriter

* Merge branch 'stable-4.0'

* Add .mailmap to correct Shawn and Saša's log entries

* Remove streaming delta support from JGit

* Cleanup catch Exception when making Java7FSFactory

* Externalize parsing exception message for RebaseCommand#Action

* Add simple chain implementations of transport hooks and loggers