pivy-importer get confused with - and _ symbols

Nobody has claimed this yet.

running this command: `java -jar pivy-importer-0.6.17-all.jar --repo ./lib/pip/ plotly:2.2.3 dash:0.19.0 dash-renderer:0.11.1 dash-html-components:0.8.0 dash-core-components:0.15.2 --replace "Babel:0.8=Babel:1.3"` will result in a missing dependency.

```
> Could not find dash-renderer.tar.gz (pypi:dash-renderer:0.11.1).
Searched in the following locations:
file:/xxx/lib/pip/pypi/dash-renderer/0.11.1/dash-renderer-0.11.1.tar.gz
> Could not find dash-html-components.tar.gz (pypi:dash-html-components:0.8.0).
Searched in the following locations:
file:/xxx/lib/pip/pypi/dash-html-components/0.8.0/dash-html-components-0.8.0.tar.gz
> Could not find dash-core-components.tar.gz (pypi:dash-core-components:0.15.2).
Searched in the following locations:
file:/xxx/lib/pip/pypi/dash-core-components/0.15.2/dash-core-components-0.15.2.tar.gz
```

But in fact the files are there just not with a - but with an _

```
$ ls -l lib/pip/pypi/dash-renderer/0.11.1/
total 125
-rw-r--r-- 1 kindler 1049089 126634 Dec 24 19:35 dash_renderer-0.11.1.tar.gz
-rw-r--r-- 1 kindler 1049089 586 Dec 24 19:42 dash-renderer-0.11.1.ivy
```
renaming the file does solve the problem.

PS I am wondering why pivy importer is not just a gradle task so we could use standard python repo and generate the ivy metadata on the fly.

PPS Happy Christmas !!

Reproduce the issue with the shown pivy-importer command and the files under lib/pip/pypi, comparing the requested dash-renderer, dash-html-components, and dash-core-components names with the underscore-named archives. Trace the importer’s artifact lookup from that command; done means it finds the existing archives without requiring them to be renamed.

Written by the indexing model from the issue text.