(GH-2161) Make NuGet.Config path absolute.
(GH-2161) Make NuGet.Config path absolute.

- Fixes #2161

devlead/cake,mholo65/cake,gep13/cake,mholo65/cake,devlead/cake,gep13/cake,robgha01/cake,cake-build/cake,robgha01/cake,patriksvensson/cake,cake-build/cake,patriksvensson/cake