cloud_controller-config.yml.erb assumes the node is also a DEA

[andreacampi]

Setting up a CC which is not also a DEA fails when trying to access node[:cloudfoundry_dea][:runtimes].

IMHO it doesn't make much sense to fill in the CC's runtimes attribute based on the runtimes available on a particular DEA.
For instance, say we have 2 DEAs dedicated to Rails and 2 DEAs dedicated to Node.
That's a supported setup in CF, and the CC should be configured to offer both.

Setting the attribute explicitly on the CC works, naturally.
Ideally, we should find DEAs with a search and configure the CF with the union of all available runtimes.