Bug 1024715 - Create test_firefox_accounts_login to validate user authen...

...tication from Settings and FMD R=zacc,bebe
apologies I did not notice this earlier but can you remove all of these hardcoded timeouts where we can safely use the variable one?
You can set this timeout by setting `--timeout= xxxx` from the command line and when you don't a default is passed in of 20 seconds for device which suffices in most cases. (10s is the default for desktopb2g, which runs significantly faster)
The only case we hardcode is when it is a real edge case that is likely to be much higher than the default timeouts, like waiting for a page to load from the internet which may take 30-60s. this case may apply in these tests?