Make RegistryConfig a typed value in the api.

Remove possible circular dependency that prevented us from using a real
type.

Signed-off-by: David Calavera <david.calavera@gmail.com>
Upstream-commit: 719886d4352cba3f2cd0092e052bb4cb67d51417
Component: engine

components/engine/utils/timeout.go

@@ -0,0 +1,21 @@
+package utils
+
+import (
+	"net"
+	"net/url"
+)
+
+// IsTimeout takes an error returned from (generally) the http package and determines if it is a timeout error.
+func IsTimeout(err error) bool {
+	switch e := err.(type) {
+	case net.Error:
+		return e.Timeout()
+	case *url.Error:
+		if t, ok := e.Err.(net.Error); ok {
+			return t.Timeout()
+		}
+		return false
+	default:
+		return false
+	}
+}