providers/plainbox-provider-checkbox: make resolution_test.qml timeout itself

This patch makes resolution_test.qml quit itself after 5 seconds. This makes
use of timeout command unnecessary.

Fixes: https://bugs.launchpad.net/plainbox-provider-checkbox/+bug/1386093
Signed-off-by: Maciej Kisielewski <maciej.kisielewski@canonical.com>
providers/plainbox-provider-checkbox: remove timeout call in resolution_test

This patch removes calling of qmlscene within timeout regim for jobs using
resolution_test.qml.

Fixes: https://bugs.launchpad.net/plainbox-provider-checkbox/+bug/1386093
Signed-off-by: Maciej Kisielewski <maciej.kisielewski@canonical.com>
"automatic merge of lp:~kissiel/checkbox/fix-1386093/ by tarmac [r=sylvain-pineau][bug=1386093][author=kissiel]"