the main thing this does is try and type slower in X - this
should cover nearly everywhere we type anything in X, and make
it type slower. We also add a bit more safety checking to some
old tests which didn't have it (mainly _do_install_and_reboot)
- wait_still_screen after typing to make sure all the keypresses
were registered before continuing.
This is an attempt to mitigate the problems we've seen where
the wrong text gets typed into the wrong places and the tests
break.
This branch is live on staging atm. It still has *some* issues,
but I do think it's an improvement.
type_string "\t\t\t\t", 20?