Set max age cors headers

Author: vlewin

lib/deploy/events/apiGateway/validate.js

@@ -26,6 +26,11 @@ module.exports = {
             cors.origin = http.cors.origin || '*';
             cors.allowCredentials = cors.allowCredentials || http.cors.allowCredentials;
 
+            // when merging, last one defined wins
+            if (_.has(http.cors, 'maxAge')) {
+              cors.maxAge = http.cors.maxAge;
+            }
+
             corsPreflight[http.path] = cors;
           }