selector: use custom domain (#1760)

* util/wrapper: improve auth errors

* client: add network call option

* client/selector: add domain select option

* client/grpc: pass network option to selector

client/options.go

@@ -64,6 +64,8 @@ type CallOptions struct {
 	ServiceToken bool
 	// Duration to cache the response for
 	CacheExpiry time.Duration
+	// Network to lookup the route within
+	Network string
 
 	// Middleware for low level call func
 	CallWrappers []CallWrapper
@@ -338,6 +340,13 @@ func WithCache(c time.Duration) CallOption {
 	}
 }
 
+// WithNetwork is a CallOption which sets the network attribute
+func WithNetwork(n string) CallOption {
+	return func(o *CallOptions) {
+		o.Network = n
+	}
+}
+
 func WithMessageContentType(ct string) MessageOption {
 	return func(o *MessageOptions) {
 		o.ContentType = ct