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Automatic merge from submit-queue RBD Plugin: Log RBD Attach/Mount/Unmout actions in addition to Detach **What this PR does / why we need it**: Currently, RBD Plugin can log a info message for a successful action of RBD Unmap, e.g.: ``` I0822 09:32:31.595162 15177 rbd_util.go:349] rbd: successfully unmap device /dev/rbd0 ``` This PR adds logs for another three important actions: Attach, Mount and Unmount. Logging these actions and associated info is *very* useful in diagnosing problems. **Special notes for your reviewer**: Example RBD Plugin logs of successful pod volume attaching and mounting: ``` I0822 09:30:27.512015 15177 rbd_util.go:148] lock list output "2017-08-22 09:30:27.493889 7fa4ae3c23c0 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.kube.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin: (2) No such file or directory\n" W0822 09:30:27.547513 15177 rbd_util.go:460] rbd: no watchers on kubernetes-dynamic-pvc-83bfd49e-871c-11e7-b88e-000c291fbe71 I0822 09:30:27.704703 15177 rbd_util.go:315] rbd: successfully map image kube/kubernetes-dynamic-pvc-83bfd49e-871c-11e7-b88e-000c291fbe71 to /dev/rbd0 I0822 09:30:27.965603 15177 rbd_util.go:322] rbd: successfully mount image kube/kubernetes-dynamic-pvc-83bfd49e-871c-11e7-b88e-000c291fbe71 at /var/lib/kubelet/plugins/kubernetes.io/rbd/rbd/kube-image-kubernetes-dynamic-pvc-83bfd49e-871c-11e7-b88e-000c291fbe71 ``` Example RBD Plugin logs of successful pod volume detaching and unmouting: ``` I0822 09:32:31.380124 15177 rbd_util.go:334] rbd: successfully umount mountpoint /var/lib/kubelet/plugins/kubernetes.io/rbd/rbd/kube-image-kubernetes-dynamic-pvc-83bfd49e-871c-11e7-b88e-000c291fbe71 I0822 09:32:31.459867 15177 rbd_util.go:148] lock list output "2017-08-22 09:32:31.443643 7f2bb8ab53c0 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.kube.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin: (2) No such file or directory\nThere is 1 exclusive lock on this image.\nLocker ID Address \nclient.64117 kubelet_lock_magic_k8s 192.168.2.128:0/4124042516 \n" I0822 09:32:31.595162 15177 rbd_util.go:349] rbd: successfully unmap device /dev/rbd0 ``` It does not add too much logs, but admins/ops can know what RBD plugin are doing internally and exact time a RBD image is mapped, mounted or unmounted (in addition to unmapped). **Release note**: ```release-note NONE ```