dont go into an infinite loop if we shut down before the log manager was fully created

(since the appContext creates a log manager if one doesn't exist, and that create will fail
if we're shutting down, and it'll create a log manager to log the fact that its failing, etc)

core/java/src/net/i2p/util/LogManager.java

@@ -102,7 +102,11 @@ public class LogManager {
         t.setName("LogWriter");
         t.setDaemon(true);
         t.start();
+        try {
             Runtime.getRuntime().addShutdownHook(new ShutdownHook());
+        } catch (IllegalStateException ise) {
+            // shutdown in progress, fsck it
+        }
         //System.out.println("Created logManager " + this + " with context: " + context);
     }
     private LogManager() {}