update mergebot config for next version of DC/OS 1.12
update mergebot config for next version of DC/OS 1.12

dcos/dcos,kensipe/dcos,kensipe/dcos,dcos/dcos,dcos/dcos,mesosphere-mergebot/dcos,dcos/dcos,GoelDeepak/dcos,mesosphere-mergebot/dcos,GoelDeepak/dcos,mesosphere-mergebot/mergebot-test-dcos,mesosphere-mergebot/mergebot-test-dcos,GoelDeepak/dcos,GoelDeepak/dcos,mesosphere-mergebot/mergebot-test-dcos,kensipe/dcos,kensipe/dcos,mesosphere-mergebot/mergebot-test-dcos,dcos/dcos,mesosphere-mergebot/dcos,mesosphere-mergebot/dcos