Change log level to warn for DynamicLogLevelExceptions

Change-Id: I3fe1c9de7fe08c3cec67cc21af0b79a4bb213cc5

Author: ChristophEichhorn

cf-java-logging-support-servlet/src/main/java/com/sap/hcp/cf/logging/servlet/dynlog/DynamicLogLevelProcessor.java

@@ -47,7 +47,7 @@ public void copyDynamicLogLevelToMDC(HttpServletRequest httpRequest) {
                                                        ALLOWED_DYNAMIC_LOGLEVELS.toString());
                 }
             } catch (DynamicLogLevelException e) {
-                LOGGER.error("DynamicLogLevelProcessor could not write dynamic log level to MDC", e);
+                LOGGER.warn("DynamicLogLevelProcessor could not write dynamic log level to MDC", e);
             }
         }
     }