Silence possible dns recordset error when deleting a server
Overview
When creating an instance, Nova creates a dns record for it. When that instance is deleted, Nova will try to delete it.
When I added !913 (merged) to recreate records as an instance is renamed, I also added code that manually deletes DNS recordsets when an instance is deleted. When nova is faster at deleting the records, Exosphere gets an error.
This MR silences the delete record set error when the delete request is made while deleting an instance.
Fixes #981 (closed)
How to Test
Create an instance and delete it a few times. You should not see an error as shown in #981 (closed) with this change.
Screenshots
No visual changes for good behavior