add contextValidatable interface

Signed-off-by: Youyuan Wu <[email protected]>

Author: youyuanwu

Diff for: interfaces.go

@@ -15,6 +15,7 @@
 package runtime
 
 import (
+	"context"
 	"io"
 	"net/http"
 
@@ -101,3 +102,11 @@ type Authorizer interface {
 type Validatable interface {
 	Validate(strfmt.Registry) error
 }
+
+// ContextValidatable types implementing this interface allow customizing their validation
+// this will be used instead of the reflective validation based on the spec document.
+// the implementations are assumed to have been generated by the swagger tool so they should
+// contain all the context validations obtained from the spec
+type ContextValidatable interface {
+	ContextValidate(context.Context, strfmt.Registry) error
+}