Menu: Add ui-front on submenus to address opacity messing up stacking order. Fixes #9650 - Menu: Disabled item visible through submenu on top
Datepicker test: Attempt to work around an issue in IE9 in TestSwarm.
Datepicker test: Attempt to work around an intermittent issue in IE when run through TestSwarm.
Datepicker test: Ignore flaky test in IE in TestSwarm.