qa/292: try to avoid race between kill and pmsignal -a <name>
qa/292: try to avoid race between kill and pmsignal -a <name>

If pmsignal gets the pid list before the previous signal has been
delivered we risk seeing ...
    /usr/libexec/pcp/bin/pmsignal: line 123: kill: (418849) - No such process
pmlseep 0.1 should suffice.

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