Project: mesos
Issue MESOS-5127: Reset `LIBPROCESS_IP` in `network\cni` isolator.
Currently the `LIBPROCESS_IP` environment variable was being set to the Agent IP if the environment variable has not be defined by the `Framework`. For containers having their own IP address (as with containers on CNI networks) this becomes a problem since the command executor tries to bind to the `LIBPROCESS_IP` that does not exist in its network namespace, and fails. Thus, for containers launched on CNI networks the `LIBPROCESS_IP` should not be set, or rather is set to "0.0.0.0", allowing the container to bind to the IP address provided by the CNI network.
Story points: 1