Add Unit Test Coverage for artifact_name_to_package_ident_regex function

[jkerry]

artifact_name_to_package_ident_regex was utilized in #25 and there is no unit test coverage. Cover cases:

• .hart file with - in the package and origin names
• .hart file without - in the package and origin names

[kmott]

I can confirm I am running into an issue with the regex using my origin kmott-test and creating a pkg mypkg, I get this from kitchen when I try to converge my environment:

       No services loaded.
       » Installing kmott/test/mypkg/0.1.0
       ↓ Downloading kmott/test/mypkg/0.1.0
       ↓ Downloading kmott/test/mypkg/0.1.0
       ↓ Downloading kmott/test/mypkg/0.1.0
       ↓ Downloading kmott/test/mypkg/0.1.0
       ↓ Downloading kmott/test/mypkg/0.1.0
       ✗✗✗
       ✗✗✗ [Err: 0] hab-sup(ER)[components/sup/src/error.rs:464:9]: We tried 5 times but could not download kmott/test/mypkg/0.1.0. Giving up.
       ✗✗✗

Additionally, I am running this pointing at a local .hart file package from my results dir.