Merge branch 'stable-5.6' into stable-5.7

* stable-5.6:
  FS.runInShell(): handle quoted filters and hooksPath containing blanks
  Handle non-normalized index also for executable files

Change-Id: I240377e87c073ee7a621a88e39fc319c59fa037a
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

diff --cc org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitCommandTest.java
Simple merge

diff --cc org.eclipse.jgit.test/tst/org/eclipse/jgit/api/StatusCommandTest.java
Simple merge

diff --cc org.eclipse.jgit.test/tst/org/eclipse/jgit/util/HookTest.java
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/util/FS_POSIX.java
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32_Cygwin.java
Simple merge