* Merge branch 'stable-5.4' into stable-5.5

* GpgKeyLocator: Return subkeys instead of the first key for subkeys

* Upgrade eclipse-jarsigner-plugin to 1.1.7
* Require Maven version 3.6.2

* Fix wrong placeholder index in error message packInaccessible
* JGitText: Remove unused externalized strings
* RepoText: Remove unused externalized string
* CLI: Remove unused externalized strings

* JGit v5.5.0.201909041048-rc1

* FileSnapshot: fix bug with timestamp thresholding
* In LockFile#waitForStatChange wait in units of file time resolution
* Cache FileStoreAttributeCache per directory
* Fix FileSnapshot#save(long) and FileSnapshot#save(Instant)
* Persist minimal racy threshold and allow manual configuration
* Measure minimum racy interval to auto-configure FileSnapshot

* Simplify file creation in ResetCommandTest

* Update gson version in org.eclipse.jgit.lfs.server manifest

* Prepare 4.9.2-SNAPSHOT builds

* Merge branch 'stable-4.8' into stable-4.9

* JGit v4.9.0.201710071750-r

* Merge branch 'stable-4.6'

* Introduce specific WantNotValidException for servers

* DirCache: Do not create duplicate tree entries
* DirCacheEditor: Replace file-with-tree and tree-with-file
* AddCommand: Use NameConflictTreeWalk to identify file-dir changes

* git rev-parse: Add --verify option

* Make BitmapIndexImpl.CompressedBitmap public
* Make BitmapIndexImpl.CompressedBitmap, CompressedBitmapBuilder static

* Replace deprecated release() methods by close()
* Use AutoClosable to close resources in bundle org.eclipse.jgit

* Buffer overflow output stream
* Fix overflow stream leak during merge conflicts
* Use local GIT_DIR for overflow during merge conflicts
* Use try-with-resources and BufferedOutputStream for local merge conflicts
* Optimize EolAwareOutputStream for bulk output

* ResolveMerger: Use checkoutEntry during abort
* Cleanup double stat update of symlinks in DirCacheCheckout
* Deprecate checkoutEntry variant that accepts File
* DirCacheCheckout: create only one ObjectReader

* Handles repo manifest file without default remote.

* Maintain list of archive formats in one place

* Update tags on fetch if --tags or tag refspec specified
* Only fetch tags that do not exist locally with auto-follow

* Comment an empty block which is ok
* Remove unnecessary @SuppressWarnings

* PackWriter: Skip progress messages on fast operations
* IndexPack: Defer the "Resolving deltas" progress meter
* IndexPack: Fix "Resolving deltas" progress meter