plugin/forward: make tls config more clear (#2326)
plugin/forward: make tls config more clear (#2326)

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jremond/coredns,yongtang/coredns,ii/coredns,miekg/coredns,johnbelamaric/coredns,miekg/coredns,coredns/coredns,jremond/coredns,chrisohaver/coredns,johnbelamaric/coredns,ii/coredns