tests: Kill containers (don't wait for shutdown)

We waste a lot of time waiting for Ubuntu containers to cleanly stop
right before we destroy them anyway.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>

src/tests/lxc-test-unpriv

@@ -168,13 +168,13 @@ p1=$(run_cmd lxc-info -n c1 -p -H)
 run_cmd lxc-info -n c1
 run_cmd lxc-attach -n c1 -- /bin/true
 
-run_cmd lxc-stop -n c1
+run_cmd lxc-stop -n c1 -k
 run_cmd lxc-clone -s -o c1 -n c2
 run_cmd lxc-start -n c2 -d
 p1=$(run_cmd lxc-info -n c2 -p -H)
 [ "$p1" != "-1" ] || { echo "Failed to start container c2"; false; }
 
-run_cmd lxc-stop -n c2
+run_cmd lxc-stop -n c2 -k
 
 if which cgm >/dev/null 2>&1; then
     echo "Testing containers under different cgroups per subsystem"