When deploying multiple compute cells, conductor module needs to source
the nova::network::neutron module otherwise the neutron settings are not
configured on the cell conductor node.
Closes-Bug: #1929427
Change-Id: I236ab69175877f8ec5d3b1bef732486ae2b15b9d
(cherry picked from commit 6392cc6620)
(cherry picked from commit 871743dd72)
(cherry picked from commit 6810790017)