De-duplicate networks in provisioning request

[zhiyanliu]

In some particular cases end user could provide duplicated networks in provisioning request by horizion with softlayer network environment, the change de-duplicate these duplicated network ids and make softlayer provision the server(s) with proper network(s).

Signed-off-by: Zhi Yan Liu [email protected]

[jimlindeman]

So the requirement in these parameters is still that there be at most two unique networks (1 private always, and optional public) and the private network must be first in the list. I'm fine with that if it makes Horizon happy. +1