Convert bool map to struct{} map in etcd.go (#2381)
Convert bool map to struct{} map in etcd.go (#2381)

This fix converts bool map to struct{} map in etcd.go
(there might be several other places).

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>
ii/coredns,chrisohaver/coredns,miekg/coredns,yongtang/coredns,johnbelamaric/coredns,miekg/coredns,ii/coredns,coredns/coredns,johnbelamaric/coredns