Merge branch 'stable-4.11' into stable-5.0

* stable-4.11:
  Prepare 4.11.6-SNAPSHOT builds
  JGit v4.11.5.201810191925-r
  Prepare 4.9.8-SNAPSHOT builds
  JGit v4.9.7.201810191756-r
  Update API problem filter
  Prepare 4.7.7-SNAPSHOT builds
  JGit v4.7.6.201810191618-r
  Update API problem filter
  Fix file handle leak in ObjectDownloadListener.onWritePossible
  Replace Findbugs with Spotbugs in org.eclipse.jgit/pom.xml
  Replace FindBugs with SpotBugs
  Prepare 4.4.2-SNAPSHOT builds
  JGit v4.0.3.201509231615-r

Change-Id: I3ec3c9af49b11979a551a9749d5a8ba5ef2ef726
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>