src: add socket wrapper for Bind

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
src: NANOSEC_PER_SEC already defined in src/global.h

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
src: udp_flood minor adjustments

Rename "burst" to "batch" as it sounds better to batch packets.

Rename function flood_with_sendmmsg() to flood_with_sendMmsg()
to make it easier to spot the function to avoid confusing it with
the function flood_with_sendmsg().

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
src: udp_client_echo.c fix spelling

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
src: make malloc_payload_buffer() a common func

And make "verbose" a common shared "extern" variable.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
src: introducing udp_sink.c

UDP sink program for testing performance of different
receive system calls.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>