@Override
    public String toString() {
        return "ConfigurationEntry [id=" + this.id + ", conf=" + this.conf + ", oldConf=" + this.oldConf + "]";
    }
Returns true when the conf entry is valid.

@return if the the entry is valid
jraft-core/src/main/java/com/alipay/sofa/jraft/conf/ConfigurationEntry.java