Decrease log level of trailing slash warning

Having an issuer without trailing slash configured is just fine, so there is no reason to log a warning for this every time the discovery endpoint is called.

Author: praseodym

openid-connect-server/src/main/java/org/mitre/discovery/web/DiscoveryEndpoint.java

@@ -287,7 +287,7 @@ OPTIONAL. JSON array containing a list of the JWS signing algorithms (alg values
 String baseUrl = config.getIssuer();
 
 if (!baseUrl.endsWith("/")) {
-logger.warn("Configured issuer doesn't end in /, adding for discovery: " + baseUrl);
+logger.debug("Configured issuer doesn't end in /, adding for discovery: {}", baseUrl);
 baseUrl = baseUrl.concat("/");
 }