Merge branch 'zmq_refactoring' into 'master'

.flake8

.gitignore

.gitlab-ci.yml

.pre-commit-config.yaml

beat/web/settings/ci.py

beat/web/settings/test.py

beat/web/utils/management/commands/broker.py

beat/web/utils/management/commands/full_scheduling.py

beat/web/utils/management/commands/scheduler.py

beat/web/utils/management/commands/worker.py

beat/web/utils/tests/__init__.py

beat/web/utils/tests/test_scheduling.py

buildout.cfg

common.cfg

dev.yml

develop.cfg

doc/admin/installation.rst

release.cfg

version.txt