fdpoll will now run a callback when about to sleep / woke up.
A new Java interface to indicate server started / sleeping / waking up.
An android implementation may allow the CPU to sleep.
If there's a java exception the server will try to shutdown.
Calling servald stop is currently undefined.
Add stateful class to represent the state of the serval daemon, shifting some functions from BatPhone
Add convenience functions to get pre-configured MDP and HTTP Restful client classes
- support mdp clients over loopback UDP
Note this is using an environment variable to specify the port number
In future we expect to support environments where this port is already bound
- monitor mdp sockets in a single & separate thread
