Adds python package name to AppConfig

This is a pulpcore 3.20 compatability requirement.

[noissue]

Author: bmbouter

pulp_python/app/__init__.py

@@ -9,3 +9,4 @@ class PulpPythonPluginAppConfig(PulpPluginAppConfig):
     name = "pulp_python.app"
     label = "python"
     version = "3.7.0.dev"
+    python_package_name = "pulp-python"