add se_assoc_id for SCTP_EVENT [gs]etsockopt

gtests/net/packetdrill/lexer.l

gtests/net/packetdrill/parser.y

gtests/net/packetdrill/run_system_call.c

gtests/net/packetdrill/script.c

gtests/net/packetdrill/script.h

...ll/tests/bsd/sctp/notifications/sctp_adaptation_event.pkt

.../tests/bsd/sctp/notifications/sctp_assoc_change_event.pkt

...ests/bsd/sctp/notifications/sctp_authentication_event.pkt

...drill/tests/bsd/sctp/notifications/sctp_notifications.pkt

...d/sctp/notifications/sctp_notifications_stopped_event.pkt

...ts/bsd/sctp/notifications/sctp_partial_delivery_event.pkt

...ll/tests/bsd/sctp/notifications/sctp_peer_addr_change.pkt

...tdrill/tests/bsd/sctp/notifications/sctp_remote_error.pkt

...etdrill/tests/bsd/sctp/notifications/sctp_send_failed.pkt

...l/tests/bsd/sctp/notifications/sctp_send_failed_event.pkt

...ll/tests/bsd/sctp/notifications/sctp_sender_dry_event.pkt

...rill/tests/bsd/sctp/notifications/sctp_shutdown_event.pkt

...et/packetdrill/tests/bsd/sctp/sctp_get_socket_options.pkt