RHBZ 1359975: pmchart run-away mem leak replaying multi-archive when rewinding
RHBZ 1359975: pmchart run-away mem leak replaying multi-archive when rewinding

Two leaks were fixed. Both occurred during the transition between archives
is a multi-archive context.

1) a leak of pmDesc * used to check for consistency of the PMNS
   between archives.

2) a build up of duplicate instance domains.

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