net/py-zeroconf: Update dependencies and add tests
- Set LICENSE_FILE
- Add tests
- One test (test_lots_of_names) is disabled now as it fails
- Remove six from dependencies (support for Python 2 was dropped in https://github.com/jstasiak/python-zeroconf/commit/f22f421e4e6bf1ca7671b1eb540ba09fbf1e04b1)
- Improve package description
PR: 236019
Reviewed by: mat
Approved by: mat (mentor), maintainer timeout (2 weeks)
Differential Revision: https://reviews.freebsd.org/D19269