JDF plugin should permit bom selection based on runtime

Forge plugin was planned prior the JBoss Stacks project ( http://www.jboss.org/jdf/stack/stacks/ ) so I think that we could update the JDF Forge plugin to use the Runtimes and Archetypes information too.

Today jdf plugin shows all available boms through command completer:

        jdf use-stack --stack <TAB> 

We should update jdf plugin to use the Runtime to display only the available BOMs/BomVersions from each Runtime:

       jdf use-stack --runtime jboss-eap-60 --bom <TAB> (change --stack to --bom)