Make HTTP listen address configurable.
See commit message for details. Note that this MR introduces a breaking change: the default HTTP listen address is now set to the IPv4 and IPv6 loopback addresses, instead of the IPv6 wildcard address.
See commit message for details. Note that this MR introduces a breaking change: the default HTTP listen address is now set to the IPv4 and IPv6 loopback addresses, instead of the IPv6 wildcard address.