Align login class capability database to upstream

Summary:
By default, FreeBSD 13 now uses the C.UTF-8 locale.

Other changes:

• The daemon account has default sensible path based on cron
• The environment variable MAIL is replaces by a capability.

Test Plan: Deploy on WindRiver

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D3033