Making sure that message fields schema doesn't default to the value from EndpointsModel. Fixes Issu…
Making sure that message fields schema doesn't default to the value from EndpointsModel. Fixes Issu…

Reviewed in https://codereview.appspot.com/7375048/

dhermes/endpoints-proto-datastore,maxandron/endpoints-proto-datastore,GoogleCloudPlatform/endpoints-proto-datastore,jbergant/endpoints-proto-datastore,mnieper/endpoints-proto-datastore