* master:
  Remove unused imports
  Silence API warnings
  Remove erraneously merged source features
  Add support for reading symrefs from pack capabilities
  Prepare 5.3.9-SNAPSHOT builds
  JGit v5.3.8.202011260953-r
  Prepare 5.1.15-SNAPSHOT builds
  JGit v5.1.14.202011251942-r
  GC#deleteOrphans: log warning for deleted orphaned files
  GC#deleteOrphans: handle failure to list files in pack directory
  Ensure that GC#deleteOrphans respects pack lock
  Prepare 5.10.0-SNAPSHOT builds
  JGit v5.10.0.202011251205-m3
  PacketLineIn: ensure that END != DELIM
  Update Orbit to S20201118210000 and add target for 4.18
  PacketLineIn: ensure that END != DELIM
  PacketLineIn: ensure that END != DELIM
  Allow to resolve a conflict by checking out a file
  Update Orbit to I20201111205634
  Document that setLastModified sets time of symlink target
  Fix bug in PerformanceLogContext
  Fix IOException occurring during gc
  Prepare 5.10.0-SNAPSHOT builds
  JGit v5.10.0.202011041322-m2
  Revert "Client-side protocol V2 support for fetching"
  Close Repository to fix tests failing on Windows
  Client-side protocol V2 support for fetching
  Update slf4j to 1.7.30
  Update Orbit to S20201027182932 (2020-12 M2)
  Fix formatting of config option values
  Document options in core section supported by JGit
  Ensure .gitmodules is loaded when accessing submodule name
  Export new package org.eclipse.jgit.logging and import it where used
  Ensure GC.deleteOrphans() can delete read-only orphaned files on Windows
  Add new performance logging
  Implement git describe --all
  Compute time differences with Duration
  Override config http.userAgent from environment GIT_HTTP_USER_AGENT
  Upgrade spotbugs-maven-plugin to 4.1.3
  Fix OperatorPrecedence warning flagged by error prone
  UploadPackTest#testUploadRedundantBytes: ensure test repo is closed
  ObjectDirectory#selectObjectRepresentation: fix formatting
  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
  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
  SshdSession: close channel gracefully
  GPG: include signer's user ID in the signature
  jgit: Add DfsBundleWriter
  Bump Bazel version to 3.5.0
  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
  Prepare 5.9.0-SNAPSHOT builds
  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
  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
  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
  sshd: use PropertyResolver in test
  FS_POSIX: avoid prompt to install the XCode tools on OS X
  Remove dependency on JSch from SSH test framework
  Use LinkedBlockingQueue for executor determining filesystem attributes
  Update API warning filters
  Remove unused imports
  Bazel: Add workspace status command to stamp final artifact
  DiffFormatter: correctly deal with tracked files in ignored folders
  Prepare 5.8.2-SNAPSHOT builds
  JGit v5.8.1.202007141445-r
  Update Jetty to 9.4.30.v20200611
  Fix writing GPG signatures with trailing newline
  Rename a test method
  Add a test for upstream bug SSHD-1028
  Improve error message when receive.maxCommandBytes is exceeded
  LfsConnectionFactory#getLfsUrl: Fix unconditional break in for-loop
  DiffFormatterTest: Add a test to confirm the default rename detection settings
  Upgrade maven-site-plugin to 3.9.1
  Upgrade build-helper-maven-plugin to 3.2.0
  Upgrade spotbugs to 4.0.4
  MergedReftable: Include the last reftable in determining minUpdateIndex
  Add new osgi fragments to maven-central deploy scripts
  PackBitmapIndex: Not buffer inflated bitmap during bitmap creation.
  Do not require org.assertj.core.annotations
  Upgrade ecj to 3.22.0
  Remove workaround for signing jars using Tycho plugins
  Use https for URL of jgit website
  Fix CI information in pom.xml
  Use gitiles as scm url in pom.xml for browsing source code
  Update API baseline to 5.8.0.202006091008-r
  Remove trailing whitespace

Change-Id: Ie6bc6954741a47cfbd32c0886bdbd7b594f08b31
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>