+ add the ability to inject push notifications in opendht to call
correct callbacks
+ if a timeout occurs and no cancelListen was called, relaunch the
listen operation
+ Pass devicekey to enable push notifications for DhtProxyClient
+ Update sockaddr to fix the build on all platforms
Note: update dhtnode
+ Add an abstract class to describe the Dht
+ Now, we can modify the Dht linked to a SecureDht. So we can choose
between the classic Dht and the Dht using a proxy.
+ Implement a basic client which can Get and Put values on the Dht using
the proxy.
Note: Update dhtnode to have the ability to use the DhtProxyClient.
Todo: Implement Listen, ping, connectivityChanged for the client.