On Centos and RHEL 6 the init system is upsart but but networking is using
sysv compatabiliy and a code path the handle this situation.
We can't use DISTRO_NAME because the centos-minimal element sets it to
centos for CentOS 7 but the centos element sets it to centos for CentOS 6.
Change-Id: Ib8e33ed78b3d6a5737eb7449bccef2d33f72b131
Closes-Bug: #1638527
This patch adds support for sysv init to the dhcp-all-interfaces element.
Specifically, it adds a sysv init script and the relevant install/config steps.
Tested with Debian jessie/testing.
Change-Id: I4ae1d5365bafda188cb65ea1fb72d8ffe2408910