Mark McLoughlin 3a2a4d9831 Make rpc_backend default to 'rabbit'
'rabbit' is the canonical name for the driver and 'kombu' is just an
alias, so let's set the default to the canonical.

Change-Id: If163ece6793d2a7d6e99d0c8df1745bbcf9a36e6
2013-10-18 14:54:26 +01:00
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