Add support for beesu - (su) graphical interface for Rhel/Fedora .

live-usb-install-beesu.patch

--- live-usb-install-orig.py	2016-05-15 13:18:34.000000000 +0200
+++ live-usb-install.py	2016-11-25 22:03:37.951168584 +0100
@@ -2997,6 +2997,8 @@
             os.system('gksu -D %s ./live-usb-install.py' % '/usr/share/applications/live-usb-install.desktop' if os.path.exists('/usr/share/applications/live-usb-install.desktop') else _('live-usb-install'))
         elif os.system('which kdesudo')==0:
             os.system('kdesudo ./live-usb-install.py')
+        elif os.system('which beesu')==0:
+            os.system('beesu ./live-usb-install.py')
         elif os.system('which sudo')==0:
             password = getText('',_('LiveUSB Install requires root privileges. Please enter your password below.'),_('Password'), password = True)
             while gtk.events_pending():