virt-install: Fix passwordvalidto, add docs

Author: crobinso

man/en/virt-install.pod.in

@@ -626,7 +626,16 @@ by 'vnc'
 
 Request a VNC password, required at connection time. Beware, this info may
 end up in virt-install log files, so don't use an important password. This
-is used by 'vnc'
+is used by 'vnc' and 'spice'
+
+=item B<passwordvalidto>
+
+Set an expiration date for password. After the date/time has passed,
+all new graphical connections are denyed until a new password is set.
+This is used by 'vnc' and 'spice'
+
+The format for this value is YYYY-MM-DDTHH:MM:SS, for example
+2011-04-01T14:30:15
 
 =back
 

virtinst/VirtualGraphics.py

@@ -274,11 +274,11 @@ def _get_xml_config(self):
         if self.keymap:
             keymapxml = " keymap='%s'" % self.keymap
         if self.listen:
-            listenxml = " listen='%s'" % self._listen
+            listenxml = " listen='%s'" % self.listen
         if self.passwd:
-            passwdxml = " passwd='%s'" % self._passwd
+            passwdxml = " passwd='%s'" % self.passwd
         if self.passwdValidTo:
-            passwdValidToxml = " passwdValidTo='%s'" % self._passwd
+            passwdValidToxml = " passwdValidTo='%s'" % self.passwdValidTo
 
         xml = "    <graphics type='%(type)s' " % { "type" : self._type } + \
                    "port='%(port)d'" % { "port" : self._port } + \