Rename create_networks to correct name as per its functionality

create_networks() method create network, subnet, router and connect
it to router but its name is sounds like it will create more than one
network. This also confusing with existing create_network() method
(without 's').

Renaming this to setup_network_subnet_with_router() which is what
this function does.

Implements: blueprint tempest-scenario-manager-stable
Change-Id: I63b3991210fd86bcc830af5beed28324797c3209
5 files changed