tao12345666333: feat: migrate leaderelection lock to leases

JobBuild
8733
07-09 12:31
pull-ingress-nginx-boilerplate 1545747539003707392
pull-ingress-nginx-chart-lint 1545747539163090944
pull-ingress-nginx-codegen 1545747539041456128
pull-ingress-nginx-gofmt 1545747539083399168
pull-ingress-nginx-golint 1545747539116953600
pull-ingress-nginx-test 1545747539209228288