Make non-default settings observable even in INFO (#1777)

Author: lucabelluccini

apm-agent-core/src/main/java/co/elastic/apm/agent/configuration/StartupInfo.java

@@ -90,7 +90,7 @@ void logConfiguration(ConfigurationRegistry configurationRegistry, Logger logger
     }
 
     private void logConfigWithNonDefaultValue(Logger logger, ConfigurationOption<?> option) {
-        logger.debug("{}: '{}' (source: {})", option.getKey(),
+        logger.info("{}: '{}' (source: {})", option.getKey(),
             option.isSensitive() ? "XXXX" : option.getValueAsSafeString(),
             option.getNameOfCurrentConfigurationSource());