Add Docker label for which network -P exposes to

[Smithx10]

I've noticed a trend in #smartos that users have started wanting to be able to specify which non fabric network -p exposes to.

Scenario:

The users usually have the external network and another network they have created, in this example lets just say dmz. They would love to be able to specify which network they expose certain ports to.
For example:

docker run -d --labels triton.publishnetwork=dmz -p 80:80 443:443 image

[KrisShannon]

This is fixed with DOCKER-1020 which was commited in 15e6923259a63e0a59f52eaed60282df8fc013cf

(Label is triton.network.public)

[travispaul]

Since this has been resolved and a fix has been merged in I'll go ahead and close this issue.