* Prepare 5.11.2-SNAPSHOT builds

* Post commit hook failure should not cause commit failure
* Allow to define additional Hook classes outside JGit
* GitHook: use default charset for output and error streams
* GitHook: use generic OutputStream instead of PrintStream

* Merge branch 'stable-5.8'

* reftable: don't check deadline on the first try
* reftable: clarify comment
* reftable: clear cache on full compaction
* reftable: remove outdated comment
* reftable: clarify that LogCursor may return a null ReflogEntry

* Update API problem filters

* Bump bazel version to 0.29.1
* Bazel: Reuse version from .bazelversion for minimum used version check

* Fix org.eclipse.jdt.core.prefs of org.eclipse.jgit.junit
* Add missing javadoc in org.eclipse.jgit.junit
* Enhance RepeatRule to report number of failures at the end
* Fix FileSnapshotTests for filesystem with high timestamp resolution
* Retry deleting test files in FileBasedConfigTest
* Measure filesystem timestamp resolution already in test setup
* Refactor FileSnapshotTest to use NIO APIs
* Measure stored timestamp resolution instead of time to touch file

* Change RacyGitTests to create a racy git situation in a stable way
* Deprecate Constants.CHARACTER_ENCODING in favor of StandardCharsets.UTF_8
* Fix non-deterministic hash of archives created by ArchiveCommand
* Update Maven plugins ecj, plexus, error-prone

* tree:<depth> should not traverse overly-deep trees
* Preliminary support for tree:<depth> filter

* Introduce RefDatabase#getTipsWithSha1 to list refs pointing to object

* Move BaseReceivePack#advertisedRefs getter and setter to ReceivePack
* Move BaseReceivePack#walk getter to ReceivePack
* Move BaseReceivePack#db getter to ReceivePack
* Move BaseReceivePack#pushCert getter and setter to ReceivePack
* Remove unused API problem filters

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

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

* GC: Remove empty references folders

* URIishTest: more Windows file-protocol tests

* Fix merge-base calculation

* DfsBlockCache: Suppress warnings about unchecked conversion of Ref<T>

* Allow using JDK 7 bootclasspath when compiling JGit using Java 8

* DirCache: Add helper to read from a tree

* Enhance BranchConfig API to expose branch.* options

* Simplify size test in PackWriter
* Declare critical exposed methods of ObjectToPack final
* Declare internal flag accessors of ObjectToPack final
* Remove unused method isDeltaAttempted()
* Simplify setDoNotDelta() to always set the flag

* Read .gitmodules config from the tree in SubmoduleWalk
* Add a CommitBuilder method to edit arbitrary DirCacheEntrys
* Add a release() method to SubmoduleWalk

* Provide an id for submodule entries.

* Throw JGit exception when ResetCommand got wrong ref