1.4.0 Service list Cannot query by group name

[zhujiebing]

Describe the bug

[mark4z]

@i will fix it.

[mark4z]

The interface return 'Param 'serviceName' is illegal, serviceName is blank', it should be optional in this one.

issue #3687 add a strong verification when NamingUtils.getGroupedName().

So, I think add a function without verification would be better.

    public static String getGroupedName(final String serviceName, final String groupName) {
        if (StringUtils.isBlank(serviceName)) {
            throw new IllegalArgumentException("Param 'serviceName' is illegal, serviceName is blank");
        }
        final String resultGroupedName = groupName + Constants.SERVICE_INFO_SPLITER + serviceName;
        return resultGroupedName.intern();
    }