KSMServer: canShutdown method

[Alex Merry]

The attached patch adds a canShutDown() method to KSMServer's D-Bus interface, 
and a canShutDown() method to KWorkSpace that takes the same arguments as 
KWorkSpace::requestShutDown().

The reason for this is that in Kickoff, we have three "leave" buttons: Logout, 
Shutdown and Reboot.  If the "Offer Shutdown Options" session management 
option is false (either because the system administrator has disabled it in a 
global configuration or because the user has disabled it in the Session 
Manager settings module), these buttons will only let the user log out.  If 
"Confirm Logout" is also disabled, the buttons will do nothing.

The solution is to hide them when "Offer Shutdown Options" is disabled.  
Rather than querying ksmserverrc in another place, I've added a canShutdown() 
method to the D-Bus interface.  This performs the same check as logout() in 
the D-Bus interface - that "Offer Shutdown Options" is enabled and the login 
manager will let us shut down.

The corresponding KWorkSpace method is modelled on requestShutDown() so that 
users can simply call canShutDown() with the same arguments they intend to 
call requestShutDown() with - if we're not in a KDE session, we can't force a 
shutdown either.

Any comments or objections?

Alex



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