clean up references to access_ip extra network
clean up references to access_ip extra network

This should make this slightly better, and have everything documented a bit
better.  If salt-cloud to use an extra network that isn't in public_ips or
private_ips, we will overwrite public_ips, and exit.

Then private_ips and public_ips are handled as normal.

Also remove some redundant code that isn't needed

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt