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Add a safe_minidom_parse_string function.
Adds a new utils.safe_minidom_parse_string function and updates external API facing Nova modules to use it. This ensures we have safe defaults on our incoming API XML parsing. Internally safe_minidom_parse_string uses a ProtectedExpatParser class to disable DTDs and entities from being parsed when using minidom. Fixes LP Bug #1100282 for Folsom. Change-Id: I6a4051b5e66f3ce5a330b2589c42e6e9e5b9268e
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