Comment 5 for bug 1396427

"We do think this a bug right? When we deploy through devstack with trove we shouldn't have a Legacy MySql datastore listed that we are unable to create an instance with."

this is definitely a bug if it surfaces in devstack.

however, to ensure the fix doesn't negatively impact someone doing a production upgrade, the following test is necessary:

* build a trove instance with 018_ being the latest version, wait til active.
* do a db_upgrade.
* if datastore-list returns nothing, the fix is incorrect.