Provide Cluster-Information

[ephe-meral]

Contexts should provide a method that can be used by shardlets to get basic info about the current R:S cluster.

The data may contain:

• The servers in the cluster
• The game-apps that can be loaded by these servers
• The load of the servers
• The running instances of game-apps on these servers

[ephe-meral]

Moved to the java api/implementation project.