Add new commands for karbor osc plugin

These command operationlog are implemented in the latest python-karborclient
project.

Change-Id: Icfafcb7cbcc5052f75b5136443935e05e1c9ec84

Author: chenying

doc/source/cli/commands.rst

@@ -204,6 +204,7 @@ conflicts when creating new plugins. For a complete list check out
 * ``data protection trigger``: (**Data Protection (Karbor)**)
 * ``data protection checkpoint``: (**Data Protection (Karbor)**)
 * ``data protection scheduledoperation``: (**Data Protection (Karbor)**)
+* ``data protection operationlog``: (**Data Protection (Karbor)**)
 * ``loadbalancer``: (**Load Balancer (Octavia)**)
 * ``loadbalancer healthmonitor``: (**Load Balancer (Octavia)**)
 * ``loadbalancer l7policy``: (**Load Balancer (Octavia)**)