Updates for ktest 5.9

 - Have config-bisect save the good/bad configs at each step.
 - Show log file location even on success
 - Add PRE_TEST_DIE to kill test if the PRE_TEST fails
 - Add a NOT operator for conditionals in config file
 - Add the log output of the last test when emailing on failure.
 - Other minor clean ups and small fixes.
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