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A simple walker that looks for get_config... lines and then executes the call.
This checks that the value exists in the default config files.
Note: I decided to put the check code in config_holder as it uses config_holder methods.
It is used by Pacman, FEC and Spynakker
It could not go into TestBase as that sits above FEC
Fixes #375
can be merged before PRs it depends on.