Much of these may be unnecessary, but this code was adapted from
go code which handles uninitialized values better via "zero values",
also the k8s python client docs show most of these fields as
"optional".
Hence, initializing leaf values in these model objects to avoid
further surprises.
Change-Id: Ib646b56dfe1ff83f0ecbedaf73fcde8ffa2be0cf
623c5056d8