FELIX-3841 CSS issues in IE with Web Console menus 

Prevent the caret on the top-level menu from being displayed. This caret
is actually confusing and causes IE9 display to break.
Also we don't set the submenu icon pointing south; the default sounds
correct for now.

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1432511 13f79535-47bb-0310-9956-ffa450edef68