Remove the plaintext NATS job
Remove the plaintext NATS job

Until now cf-deployment has deployed a NATS cluster that contained both
plaintext and TLS nodes. Internal communication was over mTLS, but clients
could choose to connect over plaintext.

This commit removes the plaintext nodes. All the software used in
cf-deployment has been modified to handle this and use NATS over mTLS.

Without the nats job, and without the nats link, everything will use the
nats-tls job and link.

Any users requiring plaintext NATS could re-enable it by keeping this
plaintext NATS job.

cloudfoundry/cf-deployment,cloudfoundry/cf-deployment