Fix stale login.conf.db
login class 'nginx' non-existent, using default Nov 20 10:56:29 freenas limits: login_getclass: unknown class 'nginx'
As a result of a stale /conf/base/etc/login.conf.db we get the above error, as well as root user without UTF-8 locale.
That file is supposed to be generated during build (its on build repo) with "cap_mkdb /conf/base/etc/login.conf"
We need to figure out why its not working so we stop having this error.