Replace setup dash with underscore to fix warnings
Replace setup dash with underscore to fix warnings

Before this fix, warnings such as [1] were issued by setup (make sdist).

[1] "(...)/setuptools/dist.py:669: UserWarning: Usage of dash-separated
'this-that' will not be supported in future versions. Please use the
underscore name 'this_that' instead" (e.g.).

dpursehouse/pygerrit2