Merge lp://qastaging/~dobey/ubuntuone-client/better-noconnect into lp://qastaging/ubuntuone-client

Move the date check into the connect method.

This reverts the changes to main.py from the previous revision, and moves the date check to the connect() method. The previous change does not actually cause the process to exit and results in any code using the DBus API hanging around waiting for the request to time out, for a very long time. Instead, we just always block connections, and allow the syncdaemon to start normally otherwise, so that ubuntuone-control-panel, u1sdtool, and Nautilus will continue working normally without problems (outside of the intent of never connecting to the server and not synchronizing files).