Update dogfooding.md to include other blob feeds required for dogfooding (dotnet...

Update dogfooding.md to include other blob feeds required for dogfooding (dotnet/corefx#41123)

* Update dogfooding.md to include other feeds

* Add a few more blob feeds that are listed in https://github.com/dotnet/core-sdk#installers-and-binaries, which are required to properly dogfood nightly SDKs
  * For example, adding only the core blob may result in build failures due to failures restoring packages that are distributed from ASP.NET feeds
* Replace MyGet with dotnet-blob feeds, since MyGet isn't used anymore

* Remove duplicate feed that's added by mistake

Commit migrated from https://github.com/dotnet/corefx/commit/115035527ef4179425be7116756cf4e69e9f4a79