periodic/security: Introduce $security_status_loginfail_ignore for 800.loginfail

Introduce a new variable "security_status_loginfail_ignore" to filter unwanted
login failure messages from the daily security checks.

Co-authored-by: Michael Osipov <michaelo@FreeBSD.org>
Co-authored-by: Joseph Mingrone <jrm@FreeBSD.org>
PR: 295191
Reviewed by: jrm
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D57671