cephadm_adopt: create a 'nfs-ganesha' pool
cephadm_adopt: create a 'nfs-ganesha' pool

When migrating from a cluster with no MDS nodes deployed,
`{{ cephfs_data_pool.name }}` doesn't exist so we need to create a pool
for storing nfs export objects.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1950403

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible