Add initial support of device posture checks (#1540)

This PR implements the following posture checks:

* Agent minimum version allowed
* OS minimum version allowed
* Geo-location based on connection IP

For the geo-based location, we rely on GeoLite2 databases which are free IP geolocation databases. MaxMind was tested and we provide a script that easily allows to download of all necessary files, see infrastructure_files/download-geolite2.sh.

The OpenAPI spec should extensively cover the life cycle of current version posture checks.

management/server/management_test.go

@@ -504,7 +504,7 @@ func startServer(config *server.Config) (*grpc.Server, net.Listener) {
 	peersUpdateManager := server.NewPeersUpdateManager(nil)
 	eventStore := &activity.InMemoryEventStore{}
 	accountManager, err := server.BuildManager(store, peersUpdateManager, nil, "", "",
-		eventStore, false)
+		eventStore, nil, false)
 	if err != nil {
 		log.Fatalf("failed creating a manager: %v", err)
 	}