-t/--config-test does not comply with docs

[TheHussky]

Describe the bug
man keepalived states that the exit codes should be the following:

       0      if OK

       1      if unable to malloc memory

       2      if cannot initialise subsystems

       3      if running with --config-test and configuration cannot be run

       4      if running with --config-test and there are configuration errors
              but keepalived will run after modifying the configuration

       5      if running with --config-test and script security hasn't been
              enabled but scripts are configured.

But I get return code 6 when running keepalived --config-test --use-file example.conf versus a config file with no script security enabled and scripts configured.

To Reproduce
Any steps necessary to reproduce the behaviour:

1. Build docker image, run it with --entrypoint /bin/ash and exec to container
2. Paste the configuration from the configuration file section to example.conf
3. keepalived --config-test --use-file example.conf
4. echo $?

Expected behavior
Keepalived --config-test exits with exit code 5

Keepalived version

Keepalived v2.3.1 (07/25,2024)

Copyright(C) 2001-2024 Alexandre Cassen, <[email protected]>
Built with kernel headers for Linux 6.6.0
Running on <omitted>
Distro: Alpine Linux v3.20

configure options: --disable-dynamic-linking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --localstatedir=/var --mandir=/usr/share/man --enable-bfd --enable-snmp --enable-snmp-rfc

Config options:  LIBIPSET LVS VRRP VRRP_AUTH VRRP_VMAC BFD OLD_CHKSUM_COMPAT SNMP_V3_FOR_V2 SNMP_VRRP SNMP_CHECKER SNMP_RFCV2 SNMP_RFCV3 INIT=systemd

System options:  VSYSLOG MEMFD_CREATE IPV6_MULTICAST_ALL IPV4_DEVCONF LIBNL3 RTA_ENCAP RTA_EXPIRES RTA_NEWDST RTA_PREF FRA_SUPPRESS_PREFIXLEN FRA_SUPPRESS_IFGROUP FRA_TUN_ID RTAX_CC_ALGO RTAX_QUICKACK RTEXT_FILTER_SKIP_STATS FRA_L3MDEV FRA_UID_RANGE RTAX_FASTOPEN_NO_COOKIE RTA_VIA FRA_PROTOCOL FRA_IP_PROTO FRA_SPORT_RANGE FRA_DPORT_RANGE RTA_TTL_PROPAGATE IFA_FLAGS LWTUNNEL_ENCAP_MPLS LWTUNNEL_ENCAP_ILA IPTABLES NET_LINUX_IF_H_COLLISION NETINET_LINUX_IF_ETHER_H_COLLISION LIBIPVS_NETLINK IPVS_DEST_ATTR_ADDR_FAMILY IPVS_SYNCD_ATTRIBUTES IPVS_64BIT_STATS IPVS_TUN_TYPE IPVS_TUN_CSUM IPVS_TUN_GRE VRRP_IPVLAN IFLA_LINK_NETNSID INET6_ADDR_GEN_MODE VRF SO_MARK

Distro (please complete the following information):

• Name: alpine
• Version: 3.20.2
• Architecture: x86_64

Details of any containerisation or hosted service (e.g. AWS)
Keepalived is run in alpine container built by make docker

Configuration file:

virtual_server_group test {
        <ommited>
}
virtual_server group test {
        lvs_sched mh
	lvs_method TUN
        protocol TCP
        real_server <ommited> {
                delay_loop 5
                HTTP_GET {
                        http_protocol 1.1
                        url {
                                path /
                                status_code 200-400
                        }
                }
                MISC_CHECK {
                        misc_path /bin/ash
                }

        }
}

Notify and track scripts

None

System Log entries

SECURITY VIOLATION - check scripts are being executed but script_security not enabled.
// Not really system logs, but the output of keepalived --config-test

Did keepalived coredump?

No

Additional context
I believe this enum

enum chk_exit_code {
	KEEPALIVED_CHK_EXIT_OK = EXIT_SUCCESS,
	KEEPALIVED_CHK_EXIT_CONFIG = 4,		/* Maintain backward compatibility */
	KEEPALIVED_CHK_EXIT_CONFIG_TEST,
	KEEPALIVED_CHK_EXIT_CONFIG_TEST_SECURITY,
} ;

is the cause.
I suggest refining manpages and docs.