Make dotnet-core a libbuildpack; extract non_lts/non_published buildpack names
Make dotnet-core a libbuildpack; extract non_lts/non_published buildpack names

Signed-off-by: Jack Feeny <08e967232d816ca2bc17cbf96236764e04db83b7@pivotal.io>

cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci