@Override
        public String getCertificate(String key, long ttl, long retry) {
            throw new UnsupportedOperationException("A certificate store is not available");
        }
An certificate store provider which provides a factory which throws exception on
invocation - as no certificate store is currently provided by default.
The purpose of this is to provide a certificate store for injection in the case where
no certificate store component is provided.

@author bratseth
container-disc/src/main/java/com/yahoo/container/jdisc/CertificateStoreProvider.java