com.docker.slirp: convert EPIPE into exceptions
com.docker.slirp: convert EPIPE into exceptions

Without this the default behaviour is to exit the program, which
is never never what you want when `write` encounters an EOF.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@docker.com>

djs55/vpnkit,djs55/vpnkit,samoht/vpnkit,djs55/vpnkit