Dynamic Network with Remote Controller example

#### dynamicnet.py

>    This script builds a network using mininet  with
> a remote controller like POX.
>
>    The script receives from command line two arguments. The number
> of Switches and the number of Hosts per Switch. Then, it will build
> the network topology based on this arguments.
> 
>    First of all, it build a topology and add the Switches to the network.
> After that, add the same number of Hosts for each Switch added. Lastly
> it make links between each switch.