Merge remote-tracking branch 'origin/v3' into v3

# Conflicts:
#	client/noop.go
#	errors/errors_test.go
#	logger/unwrap/unwrap_test.go
#	register/memory/memory_test.go
#	server/noop_test.go
#	service.go
#	util/dns/cache.go
#	util/dns/conn.go
#	util/structfs/metadata_ec2.go
#	util/time/duration.go

store/store.go

@@ -105,3 +105,7 @@ func NewWatchOptions(opts ...WatchOption) (WatchOptions, error) {
 
 	return options, err
 }
+
+func Watch(context.Context) (Watcher, error) {
+	return nil, nil
+}