Merge branch '2.8.x' of https://github.com/centreon/centreon into 2.8.x

Jenkinsfile

behat.yml

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doc/en/api/api_rest/index.rst

doc/en/developer/index.rst

doc/en/developer/writestreamconnector.rst

doc/en/release_notes/centreon-2.8/centreon-2.8.20.rst

doc/en/release_notes/centreon-2.8/centreon-2.8.21.rst

doc/en/release_notes/centreon-2.8/centreon-2.8.22.rst

doc/en/release_notes/centreon-2.8/centreon-2.8.23.rst

doc/en/release_notes/centreon-2.8/index.rst

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