[IMP] cookies: when retrieving session cookie, catch eventual errors and remove malformed cookie
[IMP] cookies: when retrieving session cookie, catch eventual parsing errors and remove cookie if incorrect (opw 605648)

In case of unparsable cookie (modified, corrupted,...), openerp would not load and crash with white screen until expiration.
With the fix goes back to login screen.
[IMP] cookies: when retrieving session cookie, catch eventual parsing errors and remove cookie if incorrect (opw 605648)

In case of unparsable cookie (modified, corrupted,...), openerp would not load and crash with white screen until expiration.
With the fix goes back to login screen.