qa/348: important fixes
qa/348: important fixes

1. the Bourne shell is in /bin/sh, not /usr/bin/sh ... I'm getting really
   tired of this recurring problem ... please use qa/new to create new
   QA tests and avoid this (and a raft of other problems).

2. /sys/kernel/security/lockdown does not always exist ... check before
   trying to feed this file to fgrep

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp