Normalize names

[ccoulombe]

name              version    python    arch
----------------  ---------  --------  -------
jaraco.classes    3.4.0      py3       generic
jaraco.context    6.0.1      py3       generic
jaraco.functools  4.1.0      py3       generic
jaraco_functools  4.3.0      py3       generic

Exact name works

$ avail_wheels "jaraco_functools"
name              version    python    arch
----------------  ---------  --------  -------
jaraco_functools  4.3.0      py3       generic

But name with dot should be normalized and still work:

$ avail_wheels "jaraco.functools"
name              version    python    arch
----------------  ---------  --------  -------
jaraco.functools  4.1.0      py3       generic