Issue #3440 Stop on Unavailable

+ revert schedulers to non-daemon threads for now so this PR can
   proceed.

Signed-off-by: Greg Wilkins <gregw@webtide.com>

examples/embedded/src/main/java/org/eclipse/jetty/embedded/LikeJettyXml.java

@@ -98,7 +98,7 @@ public class LikeJettyXml
         Server server = new Server(threadPool);
 
         // Scheduler
-        server.addBean(new ScheduledExecutorScheduler(null,true));
+        server.addBean(new ScheduledExecutorScheduler(null,false));
 
         // HTTP Configuration
         HttpConfiguration http_config = new HttpConfiguration();

jetty-proxy/src/main/java/org/eclipse/jetty/proxy/ConnectHandler.java

@@ -171,7 +171,7 @@ public class ConnectHandler extends HandlerWrapper
         {
             scheduler = getServer().getBean(Scheduler.class);
             if (scheduler == null)
-                scheduler = new ScheduledExecutorScheduler(String.format("Proxy-Scheduler-%x", hashCode()), true);
+                scheduler = new ScheduledExecutorScheduler(String.format("Proxy-Scheduler-%x", hashCode()), false);
             addBean(scheduler);
         }
 

jetty-server/src/main/java/org/eclipse/jetty/server/AbstractConnector.java

@@ -183,7 +183,7 @@ public abstract class AbstractConnector extends ContainerLifeCycle implements Co
         _executor=executor!=null?executor:_server.getThreadPool();
         if (scheduler==null)
             scheduler=_server.getBean(Scheduler.class);
-        _scheduler=scheduler!=null?scheduler:new ScheduledExecutorScheduler(String.format("Connector-Scheduler-%x",hashCode()),true);
+        _scheduler=scheduler!=null?scheduler:new ScheduledExecutorScheduler(String.format("Connector-Scheduler-%x",hashCode()),false);
         if (pool==null)
             pool=_server.getBean(ByteBufferPool.class);
         _byteBufferPool = pool!=null?pool:new ArrayByteBufferPool();

jetty-server/src/main/java/org/eclipse/jetty/server/session/HouseKeeper.java

@@ -121,7 +121,7 @@ public class HouseKeeper extends AbstractLifeCycle
 
             if (_scheduler == null)
             {
-                _scheduler = new ScheduledExecutorScheduler(String.format("Session-HouseKeeper-%x",hashCode()),true);
+                _scheduler = new ScheduledExecutorScheduler(String.format("Session-HouseKeeper-%x",hashCode()),false);
                 _ownScheduler = true;
                 _scheduler.start();
                 if (LOG.isDebugEnabled()) LOG.debug("Using own scheduler for scavenging");

jetty-server/src/main/java/org/eclipse/jetty/server/session/SessionHandler.java

@@ -523,7 +523,7 @@ public class SessionHandler extends ScopedHandler
             _scheduler = server.getBean(Scheduler.class);
             if (_scheduler == null)
             {            
-                _scheduler = new ScheduledExecutorScheduler(String.format("Session-Scheduler-%x",hashCode()), true);
+                _scheduler = new ScheduledExecutorScheduler(String.format("Session-Scheduler-%x",hashCode()), false);
                 _ownScheduler = true;
                 _scheduler.start();
             }

jetty-servlets/src/main/java/org/eclipse/jetty/servlets/DoSFilter.java

@@ -281,7 +281,7 @@ public class DoSFilter implements Filter
     {
         try
         {
-            Scheduler result = new ScheduledExecutorScheduler(String.format("DoS-Scheduler-%x",hashCode()),true);
+            Scheduler result = new ScheduledExecutorScheduler(String.format("DoS-Scheduler-%x",hashCode()),false);
             result.start();
             return result;
         }

jetty-websocket/websocket-server/src/main/java/org/eclipse/jetty/websocket/server/WebSocketServerFactory.java

@@ -87,7 +87,7 @@ public class WebSocketServerFactory extends ContainerLifeCycle implements WebSoc
     private final ClassLoader contextClassloader;
     private final Map<Integer, WebSocketHandshake> handshakes = new HashMap<>();
     // TODO: obtain shared (per server scheduler, somehow)
-    private final Scheduler scheduler = new ScheduledExecutorScheduler(String.format("WebSocket-Scheduler-%x",hashCode()),true);
+    private final Scheduler scheduler = new ScheduledExecutorScheduler(String.format("WebSocket-Scheduler-%x",hashCode()),false);
     private final List<WebSocketSessionListener> listeners = new ArrayList<>();
     private final String supportedVersions;
     private final WebSocketPolicy defaultPolicy;