Moved Config.php out to AbstractConfig to make code DRY and help extn… #1635
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This change follows what has been done with Config.php in Ups implementation, which looks most correct to me.
I've not done the DHL carrier, this could be done but involves more changes as one of the config files looks at the carrier file, so have left for now.
All shipping extensions have different switches going on in the system.xml, if we can pull this out it makes it easier for extn developers (less duplicate code). To be clear there is no bug here, this is just a suggested improvement