Clarify node_utils gem dependency
Clarify node_utils gem dependency

cisco/cisco-network-puppet-module,mikewiebe/cisco-network-puppet-module,cisco/cisco-network-puppet-module,cisco/cisco-network-puppet-module,mikewiebe/cisco-network-puppet-module,mikewiebe/cisco-network-puppet-module,cisco/cisco-network-puppet-module,mikewiebe/cisco-network-puppet-module