Teach hbsd-update to explicitly use IPv4 or IPv6
hbsd-update should gain two new config options, with their command-line argument equivalents, to force IPv4 or IPv6. This impacts every call to unbound-host and fetch.
hbsd-update should gain two new config options, with their command-line argument equivalents, to force IPv4 or IPv6. This impacts every call to unbound-host and fetch.