Merge #405897 from plainbox-provider-checkbox:phlin/fix-tainted-check

exit takes only integer args in the range 0 - 255 If we return the taint value read from /proc/sys/kernel/tainted, it might exceed this range and causing unexpected behaviour. e.g. on a system with kernel warning $ ./kernel_taint_test.py Kernel taint value is 512 Taint bit value: 9 (kernel issued warning) Taint bit value: 9 (kernel issued warning) $ echo $? 0 Let's just simplify the return logic of report_failures() to return either 0 or 1. 

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