Summary: Allow adding of more than one nic on the same network

Detail: Cloudstack allows you to launch a VM with two or more nics on the
same network, so this allows you to add more than one nic on the same network
after deployment

Submitted-by: Brian Angus <blangus@betterservers.com>
Signed-off-by: Marcus Sorensen <marcus@betterservers.com> 1359063744 -0700