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As devstack plugin is added, this commit revises install doc about installing bilean via devstack. Change-Id: I6052e83a3d503b941e8fc44a0db9f1f0d73b5816
As devstack plugin is added, this commit revises install doc about installing bilean via devstack. Change-Id: I6052e83a3d503b941e8fc44a0db9f1f0d73b5816