Add controller task
Add controller task

Define some task which will be executed on controller node and
exactly between, for instance, netconfig and check_connectivity

Change-Id: I859a61e78daaa95a52e6600fdbc06229b5744163
Implements: blueprint role-as-a-plugin

stackforge/fuel-plugins,nebril/fuel-plugins,nebril/fuel-plugins,stackforge/fuel-plugins