adminrouter: fix auth token verif key reading from file
adminrouter: fix auth token verif key reading from file

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