pmdaproc: acct: implement refresh_acct
pmdaproc: acct: implement refresh_acct

pmdaproc(acct) reads accounting information from acct file and saves
the information to ring buffer.
After that pmdaproc will update pmdaIndom with the entry of the ring buffer.
acct file will be reopend(truncated) if its size becomes too large or
some error occurs.

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