parser entry points lost during checkbox-old transition

[Zygmunt Krynicki]

During the transition from checkbox-legacy (aka -old) to the current stack we didn't copy two entry points from checkbox-old/setup.py to checkbox-support/setup.py

Those are:

    entry_points={
        'plainbox.parsers': [
            "pactl-list=checkbox.parsers.pactl:parse_pactl_output",
            "udevadm=checkbox.parsers.udevadm:parse_udevadm_output",
        ],
    },