Improve advertisepipe's error handling

[aaaaalbert]

There are two places currently where an exception can render advertisepipe non-functional but don't let it appear crashed: 1, 2. In both cases the advertise library which is called may raise AdvertiseErrors and TimeoutErrors (mostly when the node is currently disconnected from the network, or the advertise services are under high load).

Both cases need to be fenced by try/except. If an exception is encountered, it's probably best to just retry after a short pause. The advertise thread must never crash.