Revision 407820

MFH: r407273 mail/py-pyspf: Fix dependencies (missing & incorrect)

Revision 404778 [1] modified py-pyspf to only use dns/py3dns instead
of conditionally using dns/py-dns and py-py3dns depending on whether
Python 2.x or 3.x was being used.

dns/py-py3dns is a Python 3.x *only* package, but the port does not
currently [2] limit itself to USES=python:3.0+.

This results in errors for all dependent ports of py-pyspf when
Python 2.x is used, which was reported for
mail/postfix-policyd-spf-python. [3]

pyspf's README notes the following requirements:

  This package requires PyDNS (or Py3DNS for running with Python 3) and
  either the ipaddr or python3.3 and later

  This package requires authres from either pypi or
  http://launchpad.net/authentication-results-python to process
  and generate RFC 5451 Authentication Results headers.

  The spf module in this version has been tested with python3.2 and does
  not require using 2to3.

Accordingly, this change:

- Reverts to conditional RUN_DEPENDS on dns/py-dns or py-py3dns
  depending on whether Python 2.x or Python 3.x is being used.
- Adds authres to RUN_DEPENDS
- Adds a conditional RUN_DEPENDS on devel/py-ipaddr, depending on
  Python version.

While I'm here:

- Sort and group USE{S} entries
- Match COMMENT to setup.py:description
- Add test and post-extract targets, TEST_DEPENDS, and patch files
  so that tests can be run properly
- Pet several portlint warnings

[1] https://svnweb.freebsd.org/changeset/ports/404778
[2] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206645
[3] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206643

QA:

 * portlint: OK (WARN: Makefile: [47]: possible use of "${CHMOD}")
 * porttest: OK (poudriere: 11amd64, python27, python34)
 * unittest: OK (Ran 425 tests in 0.155s)

PR:			206643
Reported by:		danger
Approved by:		portmgr (blanket)
Differential Revision:	D5082

Approved by:		ports-secteam (feld)