Siad sometimes takes a very long time to stop

[avahowell]

Perhaps this should be on the main repo, but there are cases where siad takes a very long time to stop after /daemon/stop is called. We could change sia-ant to issue a Kill instead of /daemon/stop, since we're not reusing ant data.

[DavidVorick]

Siad is supposed to be shutting down quickly, we should have logs that help us find what modules/processes are blocking and solve the problem at the core instead of fix around it. Users will be running into the same issues, ant-farm is supposed to highlight the issues so we can fix them

[avahowell]

I'm going to close this issue now, since sia-ant now times out after 120 seconds and falls back to issuing a Kill signal.