core: rework how we flush incoming traffic when a socket unit goes down

Previously, we'd simply close and reopen the socket file descriptors. This is
problematic however, as we won't transition through the SOCKET_CHOWN state
then, and thus the file ownership won't be correct for the sockets.

Rework the flushing logic, and actually read any queued data from the sockets
for flushing, and accept any queued messages and disconnect them.

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