migrate to dhtnet namespace

Change-Id: I7143a010bd83e8cfa7a3c8c3072ed23f6f0ba8e3
diff --git a/src/upnp/protocol/pupnp/pupnp.cpp b/src/upnp/protocol/pupnp/pupnp.cpp
index 6ea5563..4df8621 100644
--- a/src/upnp/protocol/pupnp/pupnp.cpp
+++ b/src/upnp/protocol/pupnp/pupnp.cpp
@@ -26,7 +26,7 @@
 #include <opendht/thread_pool.h>
 #include <opendht/http.h>
 
-namespace jami {
+namespace dhtnet {
 namespace upnp {
 
 // Action identifiers.