Remove duplicate Neutron params in overcloud

In I422c65e7d941593083d52ad7fdf0dfd1d2fb3155
(Enable Neutron DVR support in TripleO installation)
we added duplicate parameters for NeutronPublicInterfaceRawDevice
and NeutronNetworkType.

In preparation for syncing with overcloud-without-mergepy.yaml
lets remove these dups.

Change-Id: Ib4888bc91f30aeb3aba590b69e4919a93f577143