Restorer: Use dbus-send, not oddjob_request

oo-restorer-wrapper.sh: Use dbus-send instead of oddjob_request, and specify a higher timeout.

oddjob_request has a fixed timeout of 25 seconds, which means that oo-restorer-wrapper.sh was timing out and returning before the gear was finished unidling.  As a consequence, restorer.php was sending the HTTP 302 redirect before the gear was ready, so the client would follow the redirect and get a HTTP 503.

This commit fixes bug 1085489.