qa/1159: drop proc and hotproc metrics
qa/1159: drop proc and hotproc metrics

Non-determinism in the time taken to fetch the proc and hotproc metrics
was leading to test failures when we failed to generate enought pmResult
records in the archive.

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