Remove ownerProcess field from LegacyDescriptor
#2245
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A file description is not owned by any one process, so the
LegacyDescriptorshould not have thisownerProcessfield. Removing this field should make it easier to supportfork()(#1987) and to support a non-ref-counted rustProcessobject in the future.The one place where this field is used is for listening TCP sockets, so the
TCPServerstruct now holds this process reference instead. The way that it's used is incorrect (#1780), but fixing that issue is much more difficult.