For routed networks deployment we need to create multiple
subnets on the controlplane network. The logic to implement
this is more involved and so doing this in python makes sense.
This change moves the current network config from
98-undercloud-setup to a python implementation.
Change-Id: I0168991a0fbd9dacf708ba2bdbc13248414affbe
Implements: blueprint tripleo-routed-networks-deployment