devel/py-checkmanifest: Rename port, Update to 0.22

- Move py-checkmanifest to py-check-manifest [1] ala upstream name.
- Update devel/Makefile
- Add MOVED entry

While I'm here:

- Update to 0.22
- Add LICENSE_FILE
- Add TEST_DEPENDS and regression-test: target
- Use a single line for PORTDOCS
- Update (prettify) pkg-descr

Changes:

  * https://github.com/mgedmin/check-manifest/blob/0.22/CHANGES.rst

[1] https://pypi.python.org/pypi/check-manifest

Approved by:	maintainer (via IRC)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@375773 35697150-7ecd-e111-bb59-0022644237b5