Initialize nginx process error channel
Initialize nginx process error channel

goroutines that write to ngxErrCh remain asleep forever without that
necessary initialization.

caicloud/ingress,kubernetes/ingress-nginx,kubernetes/ingress-nginx,aledbf/ingress-nginx,kubernetes/ingress-nginx,canhnt/ingress,aledbf/ingress-nginx,caicloud/ingress,kubernetes/ingress-nginx,caicloud/ingress,aledbf/ingress-nginx,caicloud/ingress,kubernetes/ingress-nginx,aledbf/ingress-nginx,canhnt/ingress,canhnt/ingress,canhnt/ingress