update Ansible to 2.0.0

[lifanov_mail.lifanov.com]

Summary

Ansible 2.0.0 has not been released yet. The review is for port
changes only. The UPDATING entry date and changelog URL will change.

Test Plan

build, install, and run ansible and ansible1

[lifanov_mail.lifanov.com]

The distinfo for 2.0.0 is actually for the RC2 tag. This will also change.
I'm looking for review of port changes only.

[lifanov_mail.lifanov.com]

Arcanist ate the second half of my patch. I'm re-posting it using the web interface.

[lifanov_mail.lifanov.com]

This is overcome by events: ansible 2.0.0.0, 2.0.0.1 have been release and landed in the ports tree.