Property black list (used in onUpdateProperties)

[GoogleCodeExporter]

In some cases when system properties are updated metadata is exported. This is 
unnecessary and may in some situations trigger unexpected behaviours. There 
should be a default black list with properties that are ignored. The list 
should be configurable.

Original issue reported on code.google.com by carl.nor...@gmail.com on 14 Feb 2013 at 10:15