libeventd-evp: Let the server send ENDED

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

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventd-evp: Remove server and client distinction

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventdp-evp: Check for existing connection

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventc: Allow NULL for host

Also treat empty string as NULL

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

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventc: Add passive mode

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
libeventc: Do not allow _close() in EventdEvent end signal

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