According to the netrc specification (see [1] and [2]), the `machine`
part should not be a full URL, but only a host name.
Before, using the correct netrc format with only a host name did not
work for authentication purposes in Python Inspector.
Fix this by using urllib.parse to find the matching host name.

[1]: https://www.ibm.com/docs/en/aix/7.2.0?topic=formats-netrc-file-format-tcpip
[2]: https://docs.python.org/3/library/netrc.html#netrc.netrc.hosts

Resolves: #176.

Signed-off-by: Marcel Bochtler <marcel.bochtler@bosch.com>

Support the fallback to `default` if the user did not set a specific
host name in their netrc file.

Signed-off-by: Marcel Bochtler <marcel.bochtler@bosch.com>

Signed-off-by: Marcel Bochtler <marcel.bochtler@bosch.com>

In PyPI simple repository format, package URLs typically end with the
package name and should have a trailing slash [1].
To ensure this trailing slash, the some web servers might redirect to
the URL with the trailing slash.
This causes the issue that the BasicAuth credentials are removed from
the request for security reasons.

This was observed with an internal Artifactory repository and adding a
trailing slash to the package_url fixes the issue.

[1]: https://peps.python.org/pep-0503/#specification

Resolves: #127.

Signed-off-by: Marcel Bochtler <marcel.bochtler@bosch.com>

These tests use live data from Pypi.org and the package versions have
changed in the resolution. I used these commands:

1. to run all the tests

pytest -vvs

2. to regenerate the expected JSON result files for the failed tests

PYINSP_REGEN_TEST_FIXTURES=yes pytest -vvs --lf

Then I carefully reviewed the diff before committing.

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

The README now has improved documentation to run tests and getting
started.

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