Honor CNI and bridge related fields
Honor CNI and bridge related fields

Nomad agent may silently ignore cni_path and bridge setting, when it
merges configs from multiple files (or against default/dev config).

This PR ensures that the values are merged properly.

burdandrei/nomad,hashicorp/nomad,dvusboy/nomad,hashicorp/nomad,hashicorp/nomad,hashicorp/nomad,burdandrei/nomad,dvusboy/nomad,burdandrei/nomad,dvusboy/nomad,burdandrei/nomad,dvusboy/nomad,burdandrei/nomad,burdandrei/nomad,dvusboy/nomad,dvusboy/nomad,burdandrei/nomad,hashicorp/nomad,hashicorp/nomad,dvusboy/nomad