pcp-atop: restore an original state of process accounting when pcp-atop exits
pcp-atop: restore an original state of process accounting when pcp-atop exits

Previously pcp-atop force pmdaproc to disable process accounting state
when it exits regardless of what the original state was.
pcp-atop will control the state regarding acct.control.enable_acct as
a reference count to make sure to restore the original state after
all pcp-atop instances exit.

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