flash-images: u-boot dtb folder work around.

u-boot cannot find folders that are created later...
u-boot: auto patch kernel version and change panda dtb in uEnv.txt.
ntp: Update to 4.2.8

Adresses:
CVE-2014-9293: ntp: automatic generation of weak default key in config_auth()
CVE-2014-9294: ntp: ntp-keygen uses weak random number generator and seed when generating MD5 keys
CVE-2014-9295: ntp: Multiple buffer overflows via specially-crafted packets
CVE-2014-9296: ntp: receive() missing return on error
Merge branch 'master' of ssh://git.ipfire.org/pub/git/ipfire-2.x
Add ntp update to Core Update 86