Change job exit state on requeue failure to JOB_FAILED

In commit ba54c8b418b44730be22c1564bac07bc50fc7dc the job exit
state was changed to JOB_BOOT_FAIL, which is wrong
Change job exit state on missing BG block to JOB_BOOT_FAIL

In commit ba54c8b418b44730be22c1564bac07bc50fc7dc6 it was changed
from JOB_FAILED to JOB_NODE_FAIL. JOB_BOOT_FAIL will probably be
more accurate reason