MB-100 teardown zone before and after running rza test

Change-Id: Icef94920d0c179ab59fb181c3d1627e58b75d88d
Reviewed-on: http://review.couchbase.org/31004
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>