Spotted in focal container while running pep8, updates the shebang
to use python3 explicitly, also removes the unused -tt argument.
Change-Id: Icb16ac63a83379cafe9a7dac380f2b87b881adc9
The 'releasenotes' gate job does not run our tox section. This allowed a
releasenote to land that had a filename in an incorrect format because
it was not created with 'reno new'.
Move the running of 'tools/check-releasenotes.py' to the pep8 section
and whitelist the releasenote that got merged.
Change-Id: Id5bd8e0cbc9186c89f682224088a8f23998d59c3