* Merge branch 'stable-5.9' into stable-5.10

* sshd: fix proxy connections with the DefaultProxyDataFactory
* sshd: support the HashKnownHosts configuration
* sshd: configurable server key verification
* sshd: allow setting a null ssh config
* sshd: simplify OpenSshServerKeyVerifier
* sshd: simplify ServerKeyLookup interface

* Prepare 5.3.4-SNAPSHOT builds

* Increase bazel timeout for long running tests
* Bazel: Fix lint warning flagged by buildifier
* Update bazlets to latest version
* Bazel: Add missing dependencies for ArchiveCommandTest
* Bazel: Remove FileTreeIteratorWithTimeControl from BUILD file

* Merge branch 'stable-4.10' into stable-4.11

* Clarify error message for invalid Windows characters

* Fix test setup for Eclipse Photon and greater
* Update JGit target platforms to Orbit I20181102163257

* Merge branch 'stable-5.1'

* Merge branch 'stable-4.6' into stable-4.7

* Update target platforms to Orbit R20180531190352-Photon

* Add FetchCommand#setRefSpecs(String...) variant

* LfsProtocolServlet: Pass request and path to getLargeFileRepository

* debug-rebuild-ref-tree: Copy HEAD into RefTree
* debug-rebuild-ref-tree: Add --enable flag to turn the database on
* RefTreeDatabase: Allow ORIG_HEAD, etc. on non-bare repositories
* RefTreeDatabase: Expose bootstrap refs in getAdditionalRefs

* AddCommand: Cleanup conditional logic

* Remove PackWriter.Statistics and other deprecated classes

* Treat CloneCommand.setBranch(null) as setBranch("HEAD")
* Treat CloneCommand.setRemote(null) as setRemote("origin")
* Document CloneCommand.setURI(null)
* Handle null in ProgressMonitor setters
* Document CloneCommand.setDirectory(null) and setGitDir(null) more clearly

* Silence false potential null pointer access warnings

* Externalize error message used in CheckoutCommand

* Fix the ls-remote command when there is no local repo

* Command line: implement checkout -- <path>

* Add launchers for running tests with Java 8
* Make sure we include the Java 7 module in tests when using JDK 8

* NameRevCommand: Don't use merge cost for first parent

* Avoid repacking unreachable garbage in DfsGarbageCollector

* Ignore trailing comments in transport SPI parsing

* 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