Added SPDX-License-Identifier to all scripts for better license clarity and compliance. Updated the copyright years from 2024 to 2025 in various files to reflect the current maintenance period.
jail.conf has a few tricky things about it's format (such as supporting
variable expansion) so it is easiest to get jail to do the parsing for us.
The changes to get required changes to set as well as we no longer are calling
grep so that became a single awk script as well.
