- We should report an error when user references a secret that cannot be found
- We should report output of rbd create/delete commands, logging "exit code 1"
is not enough.
Before:
```
Events:
FirstSeen LastSeen Count From SubobjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
33m 33m 1 {persistentvolume-controller } Warning ProvisioningFailed Failed to provision volume with StorageClass "cephrbdprovisioner": rbd: create volume failed, err: exit status 1
```
After:
```
Events:
FirstSeen LastSeen Count From SubobjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
33m 33m 1 {persistentvolume-controller } Warning ProvisioningFailed Failed to provision volume with StorageClass "cephrbdprovisioner": failed to create rbd image: exit status 1, command output: rbd: couldn't connect to the cluster
```
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