vtest: use per-context resource table

We want to destroy all resources owned by a context after a client
dies unexpectedly.  This is needed for --multi-clients.  See commit
6c44b4a79 (vtest: add experimental multi-client support) for more
details.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
1 file changed