provider/openstack: Allow resizing when Flavor Name changes #6020
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Previously, resizing would only work if the flavor_id changed and
would create an error if the flavor_name changes. This commit fixes
this behavior.
It also quickly refactors the getFlavorID function to use
Gophercloud's IDFromName function. getFlavorID was the basis of
IDFromName so the exact same code is used.
Fixes #5780
Side note: the standard devstack environment does not enable resizing out of the box, so an acceptance test is not possible at this time. I need to update the deploy script to account for vendoring deps and will try to roll-in resize support while I'm at it.