openstack-full: update debian kernel

Minor update on linux kernel 3.14.12 -> 3.14.13

https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.14.13
http://metadata.ftp-master.debian.org/changelogs//main/l/linux/linux_3.14.13-2~bpo70+1_changelog

Signed-off-by: Dimitri Savineau <dimitri.savineau@enovance.com>