Server side changes for provisioning subsystem

There is a whole lot of changes that need to happen on the server-side.

The most important one is the notion of storing the deployable artifacts and also the information about deployments into a 3rd party repository. For that a concept of repository-connector server-side plugin is introduced (and S-RAMP connector is provided as a default prototype impl of that).

The basis for this design is the https://docs.jboss.org/author/display/RHQ/Server-side+Storage wiki page.