sdn: clean up pod IPAM allocation even if we don't have a netns
sdn: clean up pod IPAM allocation even if we don't have a netns

We don't actually need the netns for IPAM teardown, so don't bother
passing it.  Also ensure we can release an IPAM allocation even
when the container has already died, in case kubelet didn't call
the plugin in this case.

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