Updating userguide for changes to publicIp in controller block
Updating userguide for changes to publicIp in controller block

The defaults have changed from specifying 'publicIp'='*'.
In v0.4.0 this results in a ZMQ failure, instead publicIp should
only be specified as None or ip address string.

Parsl/parsl,Parsl/parsl,Parsl/parsl,swift-lang/swift-e-lab,Parsl/parsl,swift-lang/swift-e-lab