Fix NPE on bootup.

onProcessRequest() expects the object to be fully initialized. As commit
aa0fdbb4 made DctController run on a background
thread, posted messages can be processed in parallel to the constructor,
so make sure to initialize the needed components before running code
that (eventually) will post messages.

Change-Id: Icfac54ebff5fd82c0212d0167de7ae76eb04098f