Merge branch 'stable-5.0'

* stable-5.0:
  Fix NoSuchFileException in GC.deleteTempPacksIdx()
  Fix NoSuchFileException during directory cleanup in RefDirectory

Change-Id: I35bd4bcbeac2430f674ccb6b947ac3776cec8a82
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectory.java
Simple merge