Use addCleanup instead of tearDown

We should use addCleanup instead of tearDown because:
- tearDown is executed only if the test succeeds
- cleanups (defined with addCleanup) are executed even if the test fails

This change removes useless tearDown and transforms remaining ones into
addCleanup.

Change-Id: I44bd26dcb5c8456126a35cb807f0bafc772c0ab0
1 file changed
tree: 469ded15d28112d532974b2891ccf0dd2538b7c8
  1. neutron/