common: reduce jrpc exception spam

When a client repeatedly makes a request that results in an error
the log is spammed with tracebacks that don't provide significant
value.  The method name, code, and error message should be
enough for basic troubleshooting.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/common.py

@@ -581,8 +581,8 @@ class JsonRPC:
     ) -> Dict[str, Any]:
         if method_name:
             method_name = f"Requested Method: {method_name}, "
-        log_msg = f"JSON-RPC Request Error - {method_name}Code: {code}\n{msg}"
-        if is_exc:
+        log_msg = f"JSON-RPC Request Error - {method_name}Code: {code}, Message: {msg}"
+        if is_exc and self.verbose:
             logging.exception(log_msg)
         else:
             logging.info(log_msg)