Rewrite MapX2Host as a RenderFunc using joinResults
Rewrite MapX2Host as a RenderFunc using joinResults

It's more efficient as many input Nodes map onto a few hosts.

weaveworks/scope,kinvolk/scope,alban/scope,kinvolk/scope,alban/scope,weaveworks/scope,weaveworks/scope,weaveworks/scope,alban/scope,weaveworks/scope,weaveworks/scope,alban/scope,kinvolk/scope,alban/scope,kinvolk/scope,kinvolk/scope,alban/scope,kinvolk/scope