Fix deleting zones in recordset validation tests

these tests create zones as part of the test but do clean them up
afterward slowly. This leads to these and following tests in the thread
to fail with over quota when default zone quota is sufficiently low.

Change-Id: Iab9a4308bd8e936be735ce85fdf0a419a1b68bee
(cherry picked from commit 2ffcf640bc7f205ff901f55ba0cede27b18e1cc1)
1 file changed