Significant refactor of base image

This refactor organizes the code as follows:

If RPM family:
    execute YUM repo setup
    if binary
        install binary tools
    if source
        install source tools

IF DEB family:
   install source tools

I have tested building and everything seems fairly solid except
possilby RHOS.  The long term goal of this patch is to allow us to
add our own repos in the "execute YUM repo setup" section of the base
file based upon OpenStack Infrastructure YUM repos.

Partially-Implements: blueprint rhel-based-image-support
Change-Id: I759fb8fc050973460c9c69bb500de68e88a68b3b