[cyborg] Nominating Chenke as core reviewer

Hello, Chenke has contributed substantially to Cyborg [1], esp. in the Train release, and has been an active participant in the community. I would like to acknowledge his significant past and ongoing contributions [2] and enthusiasm, and nominate him as a core reviewer for Cyborg. Please provide any feedback on his nomination by Oct 31, 2019. If there are no objections, his nomination will be made effective on Nov 1, 2019. [1] https://www.stackalytics.com/?module=cyborg-group&user_id=chenker [2] https://review.opendev.org/#/q/project:openstack/cyborg+owner:chenker Regards, Sundar