Dao Cong Tien f41adc7e8b Remove uses of rpc_backend (oslo_config)
As rpc_backend config option has been removed from
oslo_config [1], projects should not use it.
Current uses of it cause watcher crash when installing
via devstack.

[1] https://review.openstack.org/#/c/580910/

Change-Id: Iba7471e87e8935f1ea02b363f269e9debdc7cc71
2018-10-10 05:21:31 +00:00
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