python-ironicclient 3.0.0 release

meta:version: 3.0.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Dmitry Tantsur <dtantsur@protonmail.com>
meta:release:Commit: Dmitry Tantsur <dtantsur@protonmail.com>
meta:release:Change-Id: Ib3e46b2bdfe17638bae1e6f9b7751ee97fe22cd8
meta:release:Code-Review+1: Riccardo Pittau <elfosardo@gmail.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>