Add trivial constructor emission for top-level API objects
Add trivial constructor emission for top-level API objects

Signed-off-by: Alex Clemmer <2e6147cbff6661bd424c256de746b4f230002dff@gmail.com>

heptio/kube.libsonnet,ksonnet/ksonnet-lib,ksonnet/ksonnet-lib,Bradamant3/kube.libsonnet