zebra: Fix memory leaks and use after frees in nhg's on shutdown

zebra: Fix memory leaks and use after frees in nhg's on shutdown

Fixup both memory leaks as well as use after free's in nhg's
on shutdown.

This approach is effectively just iterating through all the
hash items and directly just freeing the memory instead
of handling ref counts or cross references.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>