Fixed wayland windowmanager-protocol authorization

Fixed wayland windowmanager-protocol authorization

The authorization is now handled more robust. The client tries to authenticate
as soon as a surface is created, but does so only if the authentication
token is valid. A re-authorization than happens when requestActivateWindow()
is called.
This is needed to get the auth-process properly working even with
pre-started clients, that do not have a valid token on surface-creation
time.

Change-Id: I4371b424686b9d5a6a163a802ec66a33c0aeeea7
Reviewed-on: http://codereview.qt.nokia.com/1207
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Lasse Holmstedt