taskflow 2.7.0 release

meta:version: 2.7.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:announce: openstack-dev@lists.openstack.org
meta:pypi: yes
meta:first: yes
meta:release:Author: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Commit: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Change-Id: I79dd44ac61374e15bdcffb29e506e5ed554af3bc
meta:release:Code-Review+1: ChangBo Guo(gcb) <glongwave@gmail.com>
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Workflow+1: Tony Breeds <tony@bakeyournoodle.com>
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