Deal with quick service start failures

It is possible for the service furture to fail exceptionally before we
first poll for waiting, so we should switch to a do/while loop so we
will get the exception re-thrown instead of ignoring it.

This may fix hyperledger#662

Signed-off-by: Danno Ferrin <danno.ferrin@gmail.com>

besu/src/main/java/org/hyperledger/besu/Runner.java

@@ -184,7 +184,7 @@ private void waitForServiceToStop(final String serviceName, final SynchronousShu
 
   private void waitForServiceToStart(
       final String serviceName, final CompletableFuture<?> startFuture) {
-    while (!startFuture.isDone()) {
+    do {
       try {
         startFuture.get(60, TimeUnit.SECONDS);
       } catch (final InterruptedException e) {
@@ -196,7 +196,7 @@ private void waitForServiceToStart(
       } catch (final TimeoutException e) {
         LOG.warn("Service {} is taking an unusually long time to start", serviceName);
       }
-    }
+    } while (!startFuture.isDone());
   }
 
   private void writeBesuPortsToFile() {