Binding to the first interface that has an IP address is error-prone: there is
no guarantee that ironic can reach us via this inteface. It is much safer to
detect the interface facing ironic and bind to it.
Unused LookupAgentInterfaceError exception is deleted.
The TinyIPA build also requires iptables dependency at build time to insert the
required kernel modules.
Closes-Bug: #1558956
Change-Id: I9586805e6c7f52a50834bc03efeb72d1faa6cb65