Add XmlConfigParser::getAttribute_ByteSize().
Add XmlConfigParser::getAttribute_ByteSize().

It could be used to parse the config attribute to byte size like below:

getAttribute_ByteSize(zambeziNode, "poolSize", zambeziConfig.poolSize, true);

izenecloud/sf1r-lite,pombredanne/sf1r-lite,izenecloud/sf1r-ad-delivery,izenecloud/sf1r-ad-delivery,izenecloud/sf1r-lite,izenecloud/sf1r-ad-delivery,izenecloud/sf1r-ad-delivery,pombredanne/sf1r-lite,pombredanne/sf1r-lite,pombredanne/sf1r-lite,izenecloud/sf1r-ad-delivery,pombredanne/sf1r-lite,izenecloud/sf1r-lite,izenecloud/sf1r-lite,izenecloud/sf1r-lite