Remove dotnet 1.1.7, 2.1.101, dotnet-framework 1.1.6, 2.0.3, 2.0.6.
Remove dotnet 1.1.7, 2.1.101, dotnet-framework 1.1.6, 2.0.3, 2.0.6.

Also remove a duplicate 1.1.9; I think the pipeline built it twice.

[#156864957]

Signed-off-by: Leah Hanson <59915d4d5a651c1df4fd522b917423b47c84f68b@pivotal.io>

cloudfoundry-community/asp.net5-buildpack