Fix nginx ingress unittests.
Fix nginx ingress unittests.

coryfklein/ingress,coryfklein/ingress,kubernetes/ingress-gce,danielqsj/ingress,nicksardo/ingress,canhnt/ingress,kubernetes/ingress-nginx,nicksardo/ingress,nevetS/ingress,matthewg/ingress,aledbf/ingress-nginx,canhnt/ingress,jcmoraisjr/ingress,winfield-chen-hs/ingress,winfield-chen-hs/ingress,caicloud/ingress,nicksardo/ingress,canhnt/ingress,aledbf/ingress-nginx,caiyixiang/ingress,porridge/ingress,arjanschaaf/ingress,caicloud/ingress,literalice/ingress,caicloud/ingress,chentao1596/ingress,kubernetes/ingress-nginx,kubernetes/ingress-nginx,chentao1596/ingress,caiyixiang/ingress,aledbf/ingress-nginx,danielqsj/ingress,kubernetes/ingress-gce,kubernetes/ingress-nginx,jcmoraisjr/ingress,kubernetes/ingress-nginx,aledbf/ingress-nginx,porridge/ingress,matthewg/ingress,nevetS/ingress,jcmoraisjr/ingress,literalice/ingress,nicksardo/ingress,caicloud/ingress,arjanschaaf/ingress,canhnt/ingress