Improve Pypi package detection #2524

- Streamline and remove duplicated code
- Remove lagacy metadata.json parsing
- Improve and clean tests
- Bump dparse and pkginfo

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

requirements.txt

@@ -10,7 +10,7 @@ click==6.7
 colorama==0.4.4
 commoncode==21.1.21
 debian-inspector==0.9.10
-dparse2==0.5.0.4
+dparse==0.5.1
 extractcode==21.2.24
 extractcode-7z==16.5.210223
 extractcode-libarchive==3.5.1.210223
@@ -40,7 +40,7 @@ patch==1.16
 pdfminer.six==20181108
 pefile==2019.4.18
 pip==20.3.3
-pkginfo==1.5.0.1
+pkginfo==1.7.0
 pluggy==0.12.0
 plugincode==21.1.21
 ply==3.9

setup.cfg

@@ -61,7 +61,7 @@ install_requires =
     colorama >= 0.3.9
     commoncode >= 21.1.21
     debian-inspector >= 0.9.10
-    dparse2
+    dparse >= 0.5.1
     fasteners
     fingerprints >= 0.6.0
     ftfy <  5.0.0