We can now collect logs directly into a side-car container.
A new CRD spec has been added:

spec:
  logCollector:
    enabled: true
    periodicity: 24h

Every 24h we will rotate log files for each Ceph daemon.
Signed-off-by: Sébastien Han <seb@redhat.com>
(cherry picked from commit c6a87203)

# Conflicts:
#	Documentation/ceph-cluster-crd.md
#	cluster/examples/kubernetes/ceph/cluster.yaml
#	pkg/operator/ceph/cluster/crash/crash.go