Change I810aad7d49db3f5a7fd9a2f0f746fd912fe03917 for supporting multiple
Nova cells updated the list of containers that require a policy file to
only include nova-api, nova-compute, and nova-compute-ironic.
The nova-conductor config.json template was left unchanged and fails to
copy the nova policy file into its container. This can be seen on a
fresh deployment, but might be missed on an upgrade if an older policy
file is still available in /etc/kolla/nova-conductor.
This commit removes the nova_policy_file block from the nova-conductor
config.json template, as it shouldn't be required.
Backport: ussuri, train
Change-Id: I17256b182d207aeba3f92c65a6d7cf3611180558
Closes-Bug: #1886170
c40e806587