Merge branch 'stable-5.9' into stable-5.10

* stable-5.9:
  LockFile: create OutputStream only when needed
  Remove ReftableNumbersNotIncreasingException
  Fix stamping to produce stable file timestamps

Change-Id: I056382d1d93f3e0a95838bdd1f0be89711c8a722

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

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
Simple merge