Allocate and deallocate ips one-by-one

The script is now allocating and deallocating ips one-by-one
instead of allocating all and then realising all

Change-Id: Ic53a651c8c4b0c3279f7f4cf6928a2041bd47f54
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Is this else block ever executed? It used to be associated with the loop, not the try:except, but now that it is indented it's part of the try block, which includes a break, which I think will prevent it from being executed. I think you want to shift the else block left one level.