Support for OpenShift Routes (Ingress) is not maintained by anyone, not
really tested and there are better ways to do it, so let's remove that
code from Kuryr.
Support for namespace isolation was done to mimic one of the modes of
openshift-sdn. It doesn't seem to make any sense to keep supporting it
if Network Policy support can provide the same isolation.
Change-Id: I8cfb3c50f491a5dbbfe6fa20b81ee1d0f8c6b4a7