* Merge branch 'stable-5.6' into stable-5.7

* Merge branch 'stable-5.5' into stable-5.6

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

* Merge branch 'stable-5.3' into stable-5.4

* Merge branch 'stable-5.2' into stable-5.3

* Merge branch 'stable-5.1' into stable-5.2

* Fix string format parameter for invalidRefAdvertisementLine

* Update orbit to S20200128200239 for 2020-03 M2

* WindowCache: add metric for cached bytes per repository

* pgm daemon: fallback to user and system config if no config specified

* FS: re-order fields and use all uppercase for true constants
* FS: Don't use innocuous threads for CompletableFuture

* ErrorProne: Enable and fix UnusedException check

* Update Orbit to I20200126235943 and org.junit to 4.13.0.v20200126-2018
* Fix SshSessionFactory#setInstance to use service loader

* WindowCache: add option to use strong refs to reference ByteWindows

* Use ServiceLoader to define the default SSH session factory.

* Remove Error-Prone ExpectedExceptionChecker

* ReceivePack: enable overriding filterCommands and executeCommands
* Replace ExpectedException which was deprecated in junit 4.13
* Add org.assertj 3.14.0.v20200120-1926 to target platform
* Replace deprecated junit assertion methods with hamcrest
* Update to Orbit I20200120214610 and JUnit to 4.13

* Update to Tycho 1.6.0

* Extract method refactoring in class DirCacheCheckout

* Merge branch 'stable-5.1' into stable-5.2

* Update Orbit to I20200115225246 and update dependencies
* Update bazlets and bazel version

* Merge branch 'master' into next

* Merge branch 'stable-5.7'

* Prepare 5.7.0-SNAPSHOT builds

* JGit v5.7.0.202001151323-m1

* Upgrade jetty to 9.4.25.v20191220

* Add ReftableNumbersNotIncreasingException#toString

* Replace usage of ArrayIndexOutOfBoundsException in treewalk

* Move ConnectivityChecker to fix API leak

* Merge branch 'stable-5.6'

* Merge branch 'stable-5.5' into stable-5.6

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

* Merge branch 'stable-5.3' into stable-5.4

* Merge branch 'stable-5.2' into stable-5.3

* Merge branch 'stable-5.1' into stable-5.2

* Fix API problem filters

* Add config constants for WindowCache configuration options

* Fix unclosed resource warning in SmartOutputStream
* JschConfigSessionFactory: fix boxing warning
* SshSupport#runSshCommand: don't throw exception in finally block
* Don't override already managed maven-compiler-plugin version
* Remove unused import from CreateFileSnapshotBenchmark
* Remove duplicate ignore_optional_problems entry in .classpath

* Remove no longer used API problem filter

* Remove duplicate copyright statements
* Update EDL 1.0 license headers to new short SPDX compliant format

* Update spring-boot-maven-plugin to 2.1.5.RELEASE

* TLS support on IBM JDKs

* Merge branch 'stable-5.6'

* Upgrade maven-source-plugin to 3.2.1
* Upgrade ecj to 3.20.0

* Hooks: avoid problems with backslashes in paths

* Update jetty to 9.4.24.v20191120

* Update maven-site-plugin used by benchmark module to 3.8.2
* Add dependency to enable site generation for benchmark module
* Ignore warnings for generated source code in org.eclipse.jgit.benchmark

* Using StringBuilder in StringUtils#capitalize method

* Add resource preferences for top level jgit project

* Fix MBean registration