ensure no code merges to tempest/tests

because of the restructure, we've had past merges coming into
tempest/tests. Put a check in to stop this for safety. We can
pull it at havana release safely, but it will help us on reviews
during the rest of the cycle.

Change-Id: I0714cd6f06bb89660fb121ca2394a89fc0ee9cb5
Fixes list_snapshots and _with_details methods in snap XML client

Listing was not stripping outer 'snapshots' tag before return

Change-Id: Ic95ed3b9f3f5c164f191c2445be611db2135ca54
Fixes: bug #1177610
Merge "ensure no code merges to tempest/tests"
Merge "Fixes list_snapshots and _with_details methods in snap XML client"