[VMWare Driver] When cluster name contains special characters like "/", the cluster can not be found

How to reprodue:
1) In vcenter, change the cluster name into "cluster01/1"
2) Change nova.conf
cluster_name=cluster01/1
3) Start nova-compute service, we will get following error logs:

2015-01-20 16:37:46.170 12489 CRITICAL nova [-] NotFound: All clusters specified ['cluster01/1'] were not found in the vCenter
2015-01-20 16:37:46.170 12489 TRACE nova Traceback (most recent call last):
2015-01-20 16:37:46.170 12489 TRACE nova File "/usr/bin/nova-compute", line 10, in <module>
2015-01-20 16:37:46.170 12489 TRACE nova sys.exit(main())
2015-01-20 16:37:46.170 12489 TRACE nova File "/usr/lib/python2.6/site-packages/nova/cmd/compute.py", line 72, in main
2015-01-20 16:37:46.170 12489 TRACE nova db_allowed=CONF.conductor.use_local)
2015-01-20 16:37:46.170 12489 TRACE nova File "/usr/lib/python2.6/site-packages/nova/service.py", line 275, in create
2015-01-20 16:37:46.170 12489 TRACE nova db_allowed=db_allowed)
2015-01-20 16:37:46.170 12489 TRACE nova File "/usr/lib/python2.6/site-packages/nova/service.py", line 148, in __init__
2015-01-20 16:37:46.170 12489 TRACE nova self.manager = manager_class(host=self.host, *args, **kwargs)
2015-01-20 16:37:46.170 12489 TRACE nova File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 639, in __init__
2015-01-20 16:37:46.170 12489 TRACE nova self.driver = driver.load_compute_driver(self.virtapi, compute_driver)
2015-01-20 16:37:46.170 12489 TRACE nova File "/usr/lib/python2.6/site-packages/nova/virt/driver.py", line 1439, in load_compute_driver
2015-01-20 16:37:46.170 12489 TRACE nova virtapi)
2015-01-20 16:37:46.170 12489 TRACE nova File "/usr/lib/python2.6/site-packages/nova/openstack/common/importutils.py", line 50, in import_object_ns
2015-01-20 16:37:46.170 12489 TRACE nova return import_class(import_value)(*args, **kwargs)
2015-01-20 16:37:46.170 12489 TRACE nova File "/usr/lib/python2.6/site-packages/nova/virt/vmwareapi/driver.py", line 241, in __init__
2015-01-20 16:37:46.170 12489 TRACE nova % self._cluster_names)
2015-01-20 16:37:46.170 12489 TRACE nova NotFound: All clusters specified ['cluster01/1'] were not found in the vCenter

Reason:
The VSphere API get the cluster name as a URI string. So the "/" will be transitioned into "%2f". So we can not fetch the cluster MOR by a cluster name "cluster01/1". If we change nova.conf to set cluster_name as "cluster01%2f1", it will be OK. But this is not user friendly.