Merge pull request #336 from StackStorm/remove_centos7

Fix matrix

Only run centos7 on stable

Remove centos7 from ansible runs

Merge pull request #332 from setswei/FixUnitTests

updated the ubuntu versions in all the roles metadata files, as i missed these in the last pass

updated .gitignore to exclude virtual env, additional commit is to force pipelines to run

removed reference to ubuntu 18.04

removed ubuntu18 docker template and molecule test file

removed ubuntu18.04 as it is EOL and mongodb apt keys have expired and mongo are not planing to fix it

currently there is a incompatibility with requests==0.29.0 and urllib3==1.26.13 which breaks docker-py and molecule cannont talk to the docker api on the host. version 2.29.0 of the requests python library is currently the known fix -- https://github.com/docker/docker-py/issues/3113

Merge pull request #329 from mamercad/ansible-molecule-4

Remove the changelog

Use system Python

Change `$HUBOT_SLACK_TOKEN` method