mgr/dashboard: adapt Dashboard to work with NFSv4
Description of problem¶After the following PRs:
- https://github.com/ceph/ceph/pull/32297 (volume mgr module, on CephFS-NFS exports + NFSv4 only)
- https://github.com/ceph/ceph/pull/34249 (cephadm support for volume mgr module)
- https://github.com/ceph/ceph/pull/37600 (RGW-NFS exports)
The support in Dashboard for managing NFS got broken (it can still work if the
ganesha.conf is manually created, but not with cephadm/volume mgr module).
Prior to all these changes, the Dashboard needed to manually read
ganesha.conf (stored in a RADOS pool) and each of the nfs exports (also stored in the same RADOS pool).
After this change, the dashboard shouldn't require to take care of those and it'd just need to interact with the volume mgr module API
Pending NFSv3 support¶
See https://github.com/ceph/ceph/pull/39918/files for details