delete context file

registry/gossip/context.go

@@ -1,17 +0,0 @@
-package gossip
-
-import (
-	"context"
-
-	"github.com/micro/go-micro/registry"
-)
-
-// setRegistryOption returns a function to setup a context with given value
-func setRegistryOption(k, v interface{}) registry.Option {
-	return func(o *registry.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}