Discard adding guest in server livecd.

pym/cl_install.py

@@ -2050,7 +2050,8 @@ class cl_install(color_print, SignalInterrupt):
                         self.printByResult(res)
 
                 objUsers = currentUsers()
-                if self.clVars.Get('os_root_type') == "livecd":
+                if self.clVars.Get('os_root_type') == "livecd" and \
+                    self.clVars.Get('os_install_linux_system') != "server":
                     if not objUsers.hasUsers("guest"):
                         self.printMessageForTest(_("Adding guest user"))
                         self.printByResult(objUsers.addUsers("guest","guest"))