If we are running a Ceph cluster that has an unsupported version and if
we have set allowUnsupported: false, a newly bootstrap operator will
fail to start. To fix this, the user will update the CR and set
allowUnsupported: true, however at this point clusterInfo hasn't been
initialized so the operator will panic because we were referencing a nil
pointer.
To fix this, we re-populate clusterInfo if necessary and things go
smoothly.
Closes: https://github.com/rook/rook/issues/3137
Signed-off-by: Sébastien Han <seb@redhat.com>