tests: Try to make shutdowntest a bit more robust
tests: Try to make shutdowntest a bit more robust

This should help it run better on slow test environment like the LXC CI
armhf builder.
 - Wait longer for the container to start
 - Wait longer for the container to shutdown
 - On failure to shutdown, kill the container
 - Always destroy the container if it's around

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>
Acked-by: Serge E. Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

ojkastl/lxc_Patches,ojkastl/lxc_Patches,ojkastl/lxc_Patches,ojkastl/lxc_Patches