[tripleo] nominating Harald Jensås as a core reviewer

Hey folks! I would like to nominate Harald as a general TripleO core reviewer. He has consistently done quality reviews throughout our code base, helping us with great feedback and technical insight. While he has done a lot of work on the networking and baremetal sides of the deployment, he's also helped out on security, CI, and even on the tripleoclient side. Overall, I think he would be a great addition to the core team, and I trust his judgment on reviews. What do you think? Best regards