Review controller-max-backoff and controller-inactivity-probe values

Should the the two values are used to configure how the ovs nodes connect to ODL be changed from the defaults?

• controller-max-backoff: max time between connection attempts from the nodes to ODL
• controller-inactivity-probe: time between sending inactivity probes on connections

The defaults are 8s and 5s. If the inactivity-probe hits, then the switches disconnect from ODL. That cleans up the openflowplugin operational data for the node. That is then relayed to networking-odl that the node is down and networking-odl marks the node as inactive. When a node is down, networking-odl driver would mark port-binding as failed, so VM would enter ERROR state