This change updates the requirements-and-host-config guide to include
proxy setup instructions as well as updating the ubuntu version to
include 18.04 as the reference linux flavor.
Also updated kubernetes-and-common-setup to include proxy and dns
configuration steps as well as header cleanup.
Change-Id: Ie075cdb7c32bcba5429abb9168ef7cc9b4845d89
39acd0967d