migrate to dhtnet namespace

Change-Id: I7143a010bd83e8cfa7a3c8c3072ed23f6f0ba8e3
diff --git a/include/ice_transport.h b/include/ice_transport.h
index 2615939..8fc447d 100644
--- a/include/ice_transport.h
+++ b/include/ice_transport.h
@@ -38,7 +38,7 @@
 }
 }
 
-namespace jami {
+namespace dhtnet {
 
 using Logger = dht::log::Logger;