Code review comment for lp:~diegosarmentero/ubuntuone-windows-installer/network-detect

This branch is pratically ready, but when testing IRL, using the following scenario:

* with internet connection, open the installer. You should get the login/register screen. Do nothing for now.
* disable your internet connection from the "Network and Sharing Center".
* open the installer and confirm that the "no network" sreen is shown. Do not close the installer.
* re-enable your internet connection from the "Network and Sharing Center".
* in the opened installer, click "Try again". You will now have the login/register screen, as expected.
* click on the "Sign me with my existent account" button. Nothing happens, and console errors with:

2012-01-16 11:51:11,612:612.999916077 - ubuntu_sso.controllers - DEBUG - ChooseSignInController._set_next_existing QWizard::next: Page 1 already met

If I click on the "Sign me up" button, I get nothing in the UI and in the terminal:

2012-01-16 11:51:11,612:612.999916077 - ubuntu_sso.controllers - DEBUG - ChooseSignInController._set_next_existing
QWizard::next: Page 1 already met