public String getApiKey() {
        return API_KEY;
    }
A set of hard-coded credentials for use ONLY in testing. They allow us to run
stroom and stroom-proxy such that API calls from proxy to stroom will pass
authentication out of the box.
<p>
The values used in the this class are generated by the main() method in
{@link stroom.authentication.oauth2.GenerateTestOpenIdDetails}
<p>
These default values will only be used if the following prop is set to true
{@link stroom.authentication.config.AuthenticationConfig#isUseDefaultOpenIdCredentials()}
stroom-util/src/main/java/stroom/util/authentication/DefaultOpenIdCredentials.java