common/config: strip keys appropriate for OpenStack.

builder/openstack/builder.go

@@ -51,7 +51,7 @@ func (b *Builder) Prepare(raws ...interface{}) error {
 		return errs
 	}
 
-	log.Println(common.ScrubConfig(b.config), b.config.AccessKey, b.config.SecretKey)
+	log.Println(common.ScrubConfig(b.config), b.config.Password)
 	return nil
 }