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configdrive can contain a vendor_data2.json file containing key/value pairs injected by nova's vendordata mechanism[1]. This change lets Ironic accept a vendor_data key when configdrive is provided as json, allowing parity with nova. This change requires an openstacksdk release 0.37.0 [1] https://www.madebymikal.com/nova-vendordata-deployment-an-excessively-detailed-guide/ Change-Id: Id990b970619a113c5d5ead47fb550870d91b5e04 Task: 36756 Story: 2006597 Blueprint: nova-less-deploy