[woa] dont abort if wait for net fails

When the 'wake on access' sequence starts, the first thing that is done is to wait for network connectivity (using CNetwork::HasInterfaceForIP()) for the server we need to wake.
If server is given by name, not ipaddress, a dns-lookup is made, but since server is offline that lookup may fail and so the HasInterfaceForIP() fails.
In this situation it is better to not give up (as today) but rather continue to issue a wol and see if the server comes up.

This scenario became clear int this post in this thread ; http://forum.xbmc.org/showthread.php?tid=203098&pid=1783818#pid1783818

My point is more, how do you then cancel it entirely