cli: proper ipv6 support for cli interface

We had several flaws on server side that was breaking ipv6 cli support.
accel-pppd/cli/cli_p.h — three shared helpers used by both listeners: cli_parse_hostport() (accepts host:port, [ipv6]:port, bare ::1:port via last-colon split, and :port for wildcard), cli_bind_addr()
(builds an IPv4 or IPv6 sockaddr, modeled on the existing SSTP pattern), and cli_addr_str() (formats peer addresses for logging, including v4-mapped).
accel-pppd/cli/tcp.c and telnet.c — listeners now create a socket of whichever family the configured address is; client address storage switched from sockaddr_in to sockaddr_storage so connection logging prints IPv6 peers correctly.
An invalid address now logs an error instead of silently binding garbage (previously inet_addr() failure went unchecked). Also fixed a pre-existing quirk where the fd itself was passed as the SO_REUSEADDR option value.
accel-pppd/accel-ppp.conf.5 — documented the new [::1]:2000 syntax and [::]:port for the IPv6 wildcard.

Might fix: https://github.com/accel-ppp/accel-ppp/issues/317

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

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