Added UnixSocketAddr that wraps around sockaddr_un. Using this wrapper, users can create both file based sockets as well as abstract sockets. Change-Id: Ibf105b92a6a6ac7fc9136ed307f824c83e45c06c Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/66471 Maintainer: Gabe Black <gabe.black@gmail.com> Reviewed-by: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>