Fix getting flavor data for basic ops

As of microversion 2.47 of compute api, there is no flavor
id in instance["flavor"], just dict with data related to
flavor.

Related-Prod: https://mirantis.jira.com/browse/PRODX-28606
Change-Id: I3b6223c24df112bcda21d130cafb3fae0baed66f
1 file changed