Merge branch 'stable-4.4'

* stable-4.4:
  Log if Repository.useCnt becomes negative
  Time based eviction strategy for repository cache
  Add method to read time unit from config
  Align include.path max depth with native git
  Config load should not fail on unsupported or nonexistent include path
  Allow using JDK 7 bootclasspath when compiling JGit using Java 8
  Extract work queue to allow reusing it

Change-Id: I6aeedb1cb8b0c3068af344a719c80a03ae68fc23
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

diff --cc org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java
Simple merge

diff --cc pom.xml
Simple merge