* Upgrade ecj to 3.23.0

* Support "http.userAgent" and "http.extraHeader" from the git config

* sshd: better error report when user cancels authentication

* API filters for PackStatistics.Accumulator

* Add TypedConfigGetter.getPath()

* Make Javadoc consistent for PackStatistics fields

* Measure time taken for reachability checks

* Measure time taken for negotiation in protocol V2

* IndexDiffFilter: handle path prefixes correctly

* sshd: support the ProxyJump ssh config

* Upgrade jacoco-maven-plugin to 0.8.6

* ReceivePackStats: Add size and count of unnecessary pushed objects

* Merge branch 'stable-5.9' into master

* Upgrade maven-project-info-reports-plugin to 3.1.1

* Prepare 5.9.1-SNAPSHOT builds

* JGit v5.9.0.202009080501-r

* [releng] Enable japicmp for the fragments added in 5.8.0

* GitlinkMergeTest: fix boxing warnings
* Remove unused API problem filters
* Add missing since tag on BundleWriter#addObjectsAsIs
* Merge branch 'master' into stable-5.9

* GPG: include signer's user ID in the signature

* SshdSession: close channel gracefully

* Merge branch 'stable-5.9'

* jgit: Add DfsBundleWriter

* Bump Bazel version to 3.5.0

* ResolveMerger: do not content-merge gitlinks on del/mod conflicts
* ResolveMerger: Adding test cases for GITLINK deletion
* ResolveMerger: choose OURS on gitlink when ignoreConflicts
* ResolveMerger: improving content merge readability
* ResolveMerger: extracting createGitLinksMergeResult method
* ResolveMerger: Adding test cases for GITLINK merge

* Merge branch 'stable-5.9'

* Upgrade maven-resources-plugin to 3.2.0
* Upgrade plexus-compiler version to 2.8.8

* [bazel] Add missing dependency to slf4j-api

* [errorprone] DirCacheEntry: make clear operator precedence

* [errorprone] PackWriter#parallelDeltaSearch: avoid suppressed exception

* [errorprone] Declare DirCache#version final

* Add jgit-4.17-staging target platform for 2020-09
* Update target platform to R20200831200620

* Prepare 5.10.0-SNAPSHOT builds

* Merge branch 'stable-5.9' into master

* Prepare 5.9.0-SNAPSHOT builds

* JGit v5.9.0.202008260805-m3

* Fix possible NegativeArraySizeException in PackIndexV1

* FS: use binary search to determine filesystem timestamp resolution

* Do not prematurely create directory of jgit's XDG config file
* FS: write to JGit config in a background thread
* FS: don't cache fallback if running in background

* Keep line endings for text files committed with CR/LF on text=auto

* Delay WindowCache statistics JMX MBean registration

* [releng] Update plexus-compiler to 2.8.7

* DirCache: support index V4

* Update javadoc for RemoteSession and SshSessionFactory
* Fix JSchProcess.waitFor() with time-out

* sshd: work around a race condition in Apache MINA sshd 2.4.0/2.5.x

* sshd: store per-session data on the sshd session object

* sshd: use PropertyResolver in test
* Remove dependency on JSch from SSH test framework

* FilterSpec: Use BigInteger.ZERO instead of valueOf(0)

* Do not send empty blob in response to blob:none filter
* Add support for tree filters when fetching

* FS_POSIX: avoid prompt to install the XCode tools on OS X

* Use LinkedBlockingQueue for executor determining filesystem attributes