Allows POST to create a binding as a child. Also refactors internal
and v1beta3 Binding to be more generic (so that other resources can
support Bindings).
# *** ERROR: *** Some files have not been gofmt'd. To fix these
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# gofmt -s -w pkg/kubecfg/resource_printer.go pkg/proxy/config/config.go pkg/runtime/types.go
#
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