Update kernel version in ubuntu-bootstrap.sh
Update kernel version in ubuntu-bootstrap.sh

Ubuntu-bootstrap.sh script rebooted my server
with message of re-run the script and at re-run
it again do the same thing.

I find this behavior is due to the below check

if [[ $(uname -r) != *"3.19"* ]]

As latest ubuntu kernel version is 4.2.0-27-generic,
so we should update the script for kernel version
4.2.0-27-generic.

This patch fixes the issue.
Closes-Bug: #1541797
Change-Id: I01e98d80df60fe8c5f6ac6e644d42261fdd2921c

openstack/kolla,coolsvap/kolla,negronjl/kolla,mandre/kolla,toby82/kolla,nihilifer/kolla,openstack/kolla,dardelean/kolla-ansible,stackforge/kolla,intel-onp/kolla,stackforge/kolla,toby82/kolla,intel-onp/kolla,coolsvap/kolla,toby82/kolla,rahulunair/kolla,GalenMa/kolla,mrangana/kolla,mrangana/kolla,negronjl/kolla,mandre/kolla,negronjl/kolla,GalenMa/kolla,rahulunair/kolla,coolsvap/kolla,stackforge/kolla,tonyli71/kolla,dardelean/kolla-ansible,tonyli71/kolla,nihilifer/kolla,mandre/kolla,dardelean/kolla-ansible