Test for EMSGSIZE return when sending more fds in a message then the receiver
can handle and also test the case where the reciever is using read() instead
of recvmsg() to test the unp_discard() codep

Test for EMSGSIZE return when sending more fds in a message then the receiver
can handle and also test the case where the reciever is using read() instead
of recvmsg() to test the unp_discard() codepath in the kernel. The latter test
is just instrumenting the code but has no way to check if the discarding was
successful.
OK guenther@ bluhm@

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