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It was removed in [1] but it is needed to properly build documentation on the readthedocs service. Also, as requirements-check job is checking doc/requirements.txt file and has troubles with parsing such included files, this patch proposes new requirements file only for readthedocs builds. This new file simply includes all other our requirements files. [1] https://review.opendev.org/c/x/tobiko/+/769109 Change-Id: I428b23db94c65a6138e3d3039fb28bac24c8ea8b