prometheus: do not attempt to update secret if unchanged configuration
prometheus: do not attempt to update secret if unchanged configuration

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