broker/nats: remove embed nats server reference (#1527)

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

broker/nats/options.go

@@ -7,18 +7,12 @@ import (
 
 type optionsKey struct{}
 type drainConnectionKey struct{}
-type localServerKey struct{}
 
 // Options accepts nats.Options
 func Options(opts nats.Options) broker.Option {
 	return setBrokerOption(optionsKey{}, opts)
 }
 
-// LocalServer embeds a local server rather than connecting to one
-func LocalServer() broker.Option {
-	return setBrokerOption(localServerKey{}, true)
-}
-
 // DrainConnection will drain subscription on close
 func DrainConnection() broker.Option {
 	return setBrokerOption(drainConnectionKey{}, struct{}{})