Add path to CNS client for DeleteNC (#1619)

This path was missed in a prior iteration, but is necessary for the
client to function properly. Without it, the route cannot be found and
thus the request cannot be created.

cns/client/client.go

@@ -39,6 +39,7 @@ var clientPaths = []string{
 	cns.SetOrchestratorType,
 	cns.NumberOfCPUCores,
 	cns.NMAgentSupportedAPIs,
+	cns.DeleteNetworkContainer,
 }
 
 type do interface {