Add support for the abstract socket namespace under Linux.

Unlike normal unix sockets, the abstract namespace is not bound to the
filesystem.  This has some notable advantages; /tmp need not exist, the
socket directory need not have magic permissions, etc.  xtrans servers
will listen on both the normal and abstract socket endpoints; clients
will attempt to connect to the abstract socket before connecting to the
corresponding filesystem socket.

Based on a patch by Bill Crawford.

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