qa/069: sleep to avoid race with timestamp for pmcd.conf change
qa/069: sleep to avoid race with timestamp for pmcd.conf change

This test has been a problem for a long time with sporadic failures
that have proven notoriuosly difficult to reproduce and diagnose.
This fix seems to improve the status quo because pmcd really
notices that pmcd.conf has changed after the access control
section is added.

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