GOSSIP-16 - whitespace and spelling changes.

Squashed commit of the following:
  * Replace a few System.err calls with log messages.
  * Fix misspelling
  * Rename `getMemberList` -> `getLiveMembers`

src/main/java/org/apache/gossip/manager/ActiveGossipThread.java

@@ -45,7 +45,7 @@ abstract public class ActiveGossipThread implements Runnable {
     while (keepRunning.get()) {
       try {
         TimeUnit.MILLISECONDS.sleep(gossipManager.getSettings().getGossipInterval());
-        sendMembershipList(gossipManager.getMyself(), gossipManager.getMemberList());
+        sendMembershipList(gossipManager.getMyself(), gossipManager.getLiveMembers());
       } catch (InterruptedException e) {
         GossipService.LOGGER.error(e);
         keepRunning.set(false);