src/pmdas/sample/pmns: add some more sample.dupnames.* metrics
src/pmdas/sample/pmns: add some more sample.dupnames.* metrics

Need for pmlc testing, these are aliases for sample.colour and
the assorted "bin" metrics of different flavour.

Specifically, these are the new metrics:
    sample.dupnames.four.bin
    sample.dupnames.four.colour
    sample.dupnames.five.bin
    sample.dupnames.five.bucket
    sample.dupnames.five.part_bin
    sample.dupnames.five.long_bin

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