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Load xml config from ve.cfg
1. setup lock on file
2. read info
3. remove lock
:type use_cache: bool
:rtype: tuple[xml.Document, xml.Element]
:raises: BadVeConfigException, LockFailedException
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This method works same as get_xml_config,
but returns etree object
:rtype: etree.ElementTree
:raises: BadVeConfigException, LockFailedException
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