Fixup on the hbasecon banner image.. add date and location

hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java

@@ -317,7 +317,7 @@ public class ZooKeeperWatcher implements Watcher, Abortable, Closeable {
           if (perms != Perms.ALL) {
             if (LOG.isDebugEnabled()) {
               LOG.debug(String.format("permissions for '%s' are not correct: have %0x, want %0x",
-                id, perms, Perms.ALL));
+                id.toString(), perms, Perms.ALL));
             }
             return false;
           }

src/main/site/site.xml

@@ -48,7 +48,7 @@
     <height>0</height>
     <width>0</width>
     -->
-    <src>images/hbasecon2016-stack-logo.jpg</src>
+    <src>images/hbasecon2016-stacked.png</src>
     <href>http://hbasecon.com/</href>
   </bannerLeft>
   <bannerRight>