At some places, the string that DOMAIN_REGISTRATION is got used like a boolean
(an easy misassumption to make while in python and dealing with the config
dict), making `DOMAIN_REGISTRATION=False` act as a truthy value. To stop such
future problems from happening, coerce environment config strings to real
bools.
closes#830
This will make network configuration and host based authentication
more robust, across different deployment platforms.
The options `RELAYNETS` and`POD_ADDRESS_RANGE` are kept for compatibility.
However, their usage have become optional.
