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Sphinx 2.0.0 dropped Python 2.7 support. This is aligned with [1] in requirements project. [1]Change-Id If558f184c959e4b63b56dec3ca1571d1034cfe5c keyring is also removed since it hasn't been used since change I62188e73a48f6878ce920a3b4724dba101564aef. Change-Id: Ib632c327637ba1161a8c07605fd3ef327f5606ee