Handle offline scenarios when foxbox is not connected to Internet

[nojunpark]

Although foxbox should still be operational when internet service is disrupted, there are several things we have to take care of:

1. Philips Hue adapter uses nupnp, no unpnp
2. Foxbox will give error upon startup when no IP interface is found during the startup
3. With the TLS implementation, there is no way to access the foxbox locally without the use of mDNS (not by default in mac) and a running DNS server. This means the integration tests have to run with the TLS disabled.

Design decisions should be made on how to deal with offline scenarios, including when the internet is cut during the operation. Currently foxbox does not detect the internet outage.