assert_screen on memtest working

also remove tons of old workarounds no longer valid
Merge pull request #94 from os-autoinst/coolo_memtest

assert_screen on memtest working
merge from sle

- pass plymouth.ignore-serial-consoles to show graphical boot splash
  even when there is a serial console
- fix netsetup parameters for autoyast
- add optional fips mode
- remove the sleeps in UEFI, works without now