* The default apt packages have been moved into a var file
that is only loaded when the detected OS is matched.
* The Install task file has had the apt specific tasks moved
into a named install task file.
* Ubuntu 16.04 and CentOS 7 support have been added
Implements: blueprint multi-platform-host
Change-Id: I469081671415df23a35108abf4452722ba011f9b
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>