Don't show Add New and Comments admin bar menus in network or user admins. ...

Don't show Add New and Comments admin bar menus in network or user admins.  Add tooltip to comments menu. Props ocean90. fixes #19327

git-svn-id: https://core.svn.wordpress.org/trunk@19398 1a063a9b-81f0-0310-95a4-ce76da25c4cd