python-ironicclient 4.2.0 release

meta:version: 4.2.0
meta:diff-start: -
meta:series: victoria
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Commit: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Change-Id: Iadebe6f5954371a8a96bf5d165f06c3148b7667d
meta:release:Code-Review+2: Hervé Beraud <hberaud@redhat.com>
meta:release:Code-Review+1: Dmitry Tantsur <dtantsur@protonmail.com>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>