Mode of the selftest coded as an integer value
with each bit representing a special behaviour
of the tests.
Meaning of the bits:
Bit 0: reboot on failure
Bit 1: show failure with hmRS2SigRelayState
(a trap will be send also)
Bit 2: do switch memory test on start up
Bit 3: Clear Bit 2 after next reboot if test has been
successfully completed