DTRT with kernel boot modules. (Thanks to Josh for pointing to the right logic)

Copy over previous third party modules only if a new one
does not exist in current install.

Re-enable pkg but delete the /etc/local/periodic/security folder.
snmpd needs pkg.

Remove a semicolon from the loader.conf (harmles but) which results
in a checksum mismatch in the verifier.

Ticket: #6673