Fixed GUI login redirect and web-socket idle issues.

Change-Id: Ie8b0f6fd9952e3ed8bd65c58f21032fc2d2f132f
diff --git a/web/gui/src/main/webapp/WEB-INF/web.xml b/web/gui/src/main/webapp/WEB-INF/web.xml
index 6b65ba4..bb7d7fb 100644
--- a/web/gui/src/main/webapp/WEB-INF/web.xml
+++ b/web/gui/src/main/webapp/WEB-INF/web.xml
@@ -22,7 +22,7 @@
     <display-name>ONOS GUI</display-name>
 
     <welcome-file-list>
-        <welcome-file>index.html</welcome-file>
+        <welcome-file>/index.html</welcome-file>
     </welcome-file-list>
 
     <!--