Move nova compute pillar to cluster level.

With the old setup there was no possibility to not
to install contrail-nova-driver because of pillar:
nova:
  compute:
    networking: contrail

So contrail-nova-driver was installed also with k8s
setup which is not desired.
This logic was moved to cluster level.

 PROD-23348

Change-Id: I83acaa6ef0645adde4e7c1b06d6f5201169dbb84
4 files changed