Since Rocky neutron has support to enable routed networks on
existing an network and subnet if certain conditions are met.
The tripleo undercloud does meet these conditions.
This change updates the extraconfig post script that creates
the neutron ctlplane networks. Any non routed network is
updated to a routed network if 'enable_routed_networks' = True
in the configuration.
Closes-Bug: #1790877
Change-Id: Idf2dd4c158d29b147d48153d3626cf403059d660