Description of problem:

TripleO now uses cephadm to bootstrap the Ceph cluster and apply the related daemons [0].
ceph-nfs is still deployed using tripleo-ansible, resulting in a cephadm unmanaged component.
Since Manila is going to adapt the ganesha driver to work in a cephadm context, TripleO can now align the existing code to deploy the ceph-nfs component and manage it via the orchestrator [1].
This bz is supposed to track the required changes in TripleO:

1. Update the ceph_mkspec library to support the ingress daemon;
2. Remove the pcs ceph-nfs and vip constraints for fresh deployments;
3. Deploy a new ingress component that uses the ceph-nfs cephadm deployed daemon as backend


[0] https://github.com/openstack/tripleo-specs/blob/master/specs/wallaby/tripleo-ceph.rst
[1] https://github.com/openstack/tripleo-specs/blob/master/specs/yoga/tripleo_ceph_manila.rst

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