qa_rapi: Fix filter arguments being passed in wrong order

We can now also remove the "Filtering locks didn't fail" test
because filtering locks is actually supported.

Signed-off-by: Niklas Hambuechen <niklash@google.com>
qa_rapi: Clean up PUT testing

This makes it clear where `trivial_filter` is actually used.

Signed-off-by: Niklas Hambuechen <niklash@google.com>
qa_rapi: Use `namefield`, not "name" hardcode

Signed-off-by: Niklas Hambuechen <niklash@google.com>