install: introduce VM image kickstart

The initial OSE VM image is an all-in-one install with a desktop for
accessing it via rhc, web console, or JBoss Developer Studio. The image
is built via unattended kickstart. "make" now generates openshift-vm.ks
from the files and configuration under the enterprise/install/vm dir.
Merge pull request #352 from sosiouxme/enterprise-2.1-vm

Enterprise 2.1 vm