455706 update JGit to 3.5.3.201412180710-r

to fix security issue
https://dev.eclipse.org/mhonarc/lists/egit-dev/msg03717.html

Bug: 455706
Change-Id: I33f919325b6688aaf2a4630789ba15c0db81c8c9
Signed-off-by: Jan Sievers <jan.sievers@sap.com>