Nats stream forwarder streams its local nats server

* Increase nats_z1 in cf-infrastructure-aws to 1 instance
* properties.nats.address defaults to nats_z1/0 rather than nats_z2/0

[#78419290]
Fix vcap ownership in nats_stream_forwarder

[#78494912]
Sync submodules before updating in update script