add security group pro in network field when creating server

in Neutron Network, we can attach more than one network to the instance. It will be confused using the following cli.

    nova boot test --flavor m1.tiny --security_group ssh --security_group \
            http --nic net-id=xxxxxxxxxxx --nic port-id=yyyyyyyyyyy

Which port/nic the security group should bind to? the first one? both? or none?

The legacy network will be removed and I think it is the time to change the API to satisfied the new situation. May be the new cli like below:

    nova boot test --flavor m1.tiny --nic net-id=xxxxxx,security_group=ssh \
         --nic port-id=yyyyyyyyy \
         --nic net-id=zzzzzzzz,security_group=http,security_group=mysql

So I think we should refactor the nova api to support above cli. May be we need a new micro version api