www/py-django-auth-ldap: Update to 1.7.0

[kai]

Summary

While I'm here:

• Pet portlint

Notable changes since 1.5.0:

• Add support for Python 3.7 and Django 2.1
• Fix group membership queries with DNs containing non-ascii characters on Python 2.7
• All changes can be retrieved here:

https://github.com/django-auth-ldap/django-auth-ldap/blob/1.7.0/CHANGES

PR: 236051
Approved by: (one of the mentors), maintainer (might be a timeout, we have still to wait some days)

Test Plan

• poudriere (11.2-, 12.0-RELEASE, 13.0-CURRENT@r344112 amd64 + i386) for each py27 + py36 flavor -> OK
• portlint -> OK
• Runtime tests -> OK

[miwi]

LGTM