update sysutils/ansible to 2.3.0.0

This is a major release!

https://raw.githubusercontent.com/ansible/ansible/v2.3.0.0-1/CHANGELOG.md

o stop "fixing" default interpreter of /usr/bin/python
o remove NETADDR option and depend on py-netaddr unconditionally

Differential Revision: https://reviews.freebsd.org/D10165