pfSense

Fix #8417

- Changed default value for Maximum Table Entries to 400000 in order to
make bogonsv6 to work
- Added code to upgrade config and set default value on systems where
it's not defined
- Changed default config to match new default and version 18.0
- Added checks to enable 'block bogons' and to enable IPv6 requesting
the minimum value
- Notify admin when Maximum Table Entries value is too small and in
this case skip bogonsv6 table creation