tests: Forcefully kill the daemon when the tests are done

The elecrtum RPC thread can in some circumstances deadlock when shutting
down. This let the tests pass even if the daemon doesn't shutdown cleanly.

An actual proper fix will be implemented soon, tracked here:
#66

scripts/setup-env.sh

@@ -48,11 +48,11 @@ runbwt () {
 cleanup() {
   trap - SIGTERM SIGINT
   set +eo pipefail
-  kill `jobs -rp` 2> /dev/null
+  kill -9 `jobs -rp` 2> /dev/null
   wait `jobs -rp` 2> /dev/null
   ele daemon stop &> /dev/null
   [ -n "$KEEP_DIR" ] || rm -rf $DIR
-  kill -- -$$ 2> /dev/null
+  kill -9 -- -$$ 2> /dev/null
 }
 trap cleanup SIGINT SIGTERM EXIT
 

src/electrum/server.rs

@@ -559,6 +559,7 @@ impl ElectrumServer {
                 for (_, subscriber) in subman.subscribers.iter() {
                     let _ = subscriber.sender.send(Message::Done);
                 }
+                // FIXME this can deadlock
                 trace!(target: LT, "waiting for {} RPC threads", children.len());
                 for child in children {
                     let _ = child.join();