[Bug 250014] usr.sbin/syslogd/syslogd.c: Forgotten changes for support RFC 5424

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250014

--- Comment #2 from Boris Korzun <drtr0jan at yandex.ru> ---
In RFC 3164 (bsd-format): The Domain Name MUST NOT be included in the HOSTNAME
field.
In RFC 5424 (ietf-format): The HOSTNAME field SHOULD contain the hostname and
the domain name of the originator in FQDN format.

Without the patch syslogd(8) uses trimdomain() for addresses received from
socket by socklist_recv_sock() (via cvthname()) and addresses used by config
filtering by readconfigfile() (via cfline()).

So, hostname filtering works incorrectly with "-O syslog" in next cases:
* using "+@" filtering - "localhost" (without domain name) is used for
comparing with FQDN-names (ex. "localhost.localdomain");
* using "+server.localdomain" filtering, "-H" flag and localdomain clients -
"server" (without domain name) is used for comparing with FQDN-names (ex.
"bsd.localdomain").

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