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.

Related-prod: PRODX-295
Change-Id: Iab9a4308bd8e936be735ce85fdf0a419a1b68bee
(cherry picked from commit 2ffcf640bc7f205ff901f55ba0cede27b18e1cc1)
(cherry picked from commit 75fc0e50d61a76f9c6cfe919bc8f492790c91daf)
1 file changed