libeventc/tests/reconnection: Minor rework

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
tests: Use 127.0.0.1 instead of localhost

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventc: Fix the close() async logic

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
protocol: Require a category for EVENT

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
protocol: Remove handshake

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
protocol: The event id is now on the client side

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
protocol: Remove acknowledgement messages

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
protocol: Prefix '.'-ended messages by '.'

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
autotools: Fix distcheck without any nd backend

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>