Due to the differences between Ubuntu and Centos around Apache2 I have
had to copy both start.sh and config-external.sh to be unique files
for Ubuntu so as not to affect Centos either. This can be removed when
we change the way config-external works.

Change-Id: I14dc11e7bb6284b897259a53acc914ae8f254d3c
Partially-Implements: blueprint install-from-ubuntu