readd some debug output and make sure zypper_up works more reliable
bootloader test should not cause rollback
fix mediacheck

mediacheck is just an additional parameter that can be added to any installation mode.
create separate iso_size test
use waitforneedle for the kde reboot
implement USBOOT (action #508)
change test_class to test_flags and extend it

'fatal' means die after failure
'milestone' means update 'lastgood'
'important' means set 'overall' to 'fail' after failure
fix result logic

- a test may only be set to ok if no previous result exists
- a test must be set to failed always, even if it was previously set
  to ok
remove another place of evil env modification ☠☠☠

If the test name ends in 'uefi' it overwrites it with '1'
refactor usb install a bit
add check_screen to consoletest finish

this test is important for the overall result so at least here we need
to have a check_screen.
do no longer check_screen after each test but add it to the consoletests manually
refactor become_root and move the removal of the cd repo in an extra test
give the x11 tests some time to finish their closing tasks
some x11 tests expect sshd to run, so we better update lastgood
fix path to pool
log more env variables
overwriting LIVECD is evil
use become_root in sshfs
mark uefi bootloader as important