test: Fix flaky ingress tests
test: Fix flaky ingress tests

If the ingress controller is not yet, polling will result in a global
error. Before this would end the polling. Instead now we still keep on
polling to give the ingress controller more time to start.

jescarri/prometheus-operator,mmerrill3/prometheus-operator,mmerrill3/prometheus-operator,brancz/prometheus-operator,nirdothan/prometheus-operator,jescarri/prometheus-operator,eedugon/prometheus-operator,eedugon/prometheus-operator,brancz/prometheus-operator,coreos/prometheus-operator,gianrubio/prometheus-operator,sjuxax/prometheus-operator,gianrubio/prometheus-operator,nirdothan/prometheus-operator,sjuxax/prometheus-operator,coreos/prometheus-operator,brancz/prometheus-operator,gianrubio/prometheus-operator,mmerrill3/prometheus-operator