ServerHandler: avoid leaking ServerResolver in ::run().
ServerHandler: avoid leaking ServerResolver in ::run().

This changes the ServerResolver used in the ServerHandler thread to be
properly cleaned up after we've performed name resolution.

Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble