Remove expired ports:

2020-01-31 www/py-dj21-django-auth-ldap: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 www/py-dj21-django-crispy-forms: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 www/sogo3-activesync: Deprecated, replaced by www/sogo4
2020-01-31 devel/sope3: Deprecated, replaced by devel/sope4
2020-01-31 www/py-dj21-django-mptt: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 graphics/py-willow11: Use graphics/py-willow instead
2020-01-31 www/py-dj21-django-tables2: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 www/py-dj21-django-debug-toolbar: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 security/krb5-115: EOL one year after the release of krb5 1.17
2020-01-31 www/py-dj21-django-taggit: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 www/py-dj21-django-cors-headers: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 graphics/py-imgurpython: No longer supported by upstream
2020-01-31 www/py-dj21-django-taggit-serializer: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 www/py-dj21-django-filter: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 www/py-dj21-django-timezone-field: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 devel/py-xarray011: Use devel/py-xarray instead
2020-01-31 www/py-django-modelcluster4: Use www/py-django-modelcluster instead
2020-01-31 devel/py-semantic_version26: Use devel/py-semantic_version instead
2020-01-31 www/py-dj21-django-js-asset: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible
2020-01-31 www/py-dj21-drf-yasg: Django 2.1 is now End-of-Life (Since December 2 2019) and no longer supported. Switch to Django 2.2+ versions of this port as soon as possible