tests: drop python 2.7 support

3 jobs for topic/default/gitlab-ci-generated-from-tox in 1 minute and 43 seconds (queued for 9 seconds)
Status Name Job ID Coverage
  Test
passed check-manifest #43765

00:00:18

passed flake8 #43766

00:00:18

passed py3 #43767

00:01:42