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
Bump src/gorouter

Bump :
  Michael Fraenkel:
     Seed a random number generator
Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Michael Fraenkel:
     Fix space associations ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/35173470 )