Clean up apt package list

Clean up apt package list

* Combine all packages in to a single call to apt-get install
* Modify /etc/apt/apt.conf
* corrected a comment
* not doing redundant edit of /etc/sysctl.conf
* adding emacs files to .gitignore
* Exercised this code while producing a new base image for each targetted platform
* install java8 from official openjdk PPA if platform is 14.04
* detect correct python package to install in CentOS
* open (and later close) stdout and stderr logs for later review

Change-Id: I669c0c3043f0c90df7af5033b8e180b0e6dc696a
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>