migrate to dhtnet namespace

Change-Id: I7143a010bd83e8cfa7a3c8c3072ed23f6f0ba8e3
diff --git a/src/upnp/upnp_context.cpp b/src/upnp/upnp_context.cpp
index a36e56f..35fdb50 100644
--- a/src/upnp/upnp_context.cpp
+++ b/src/upnp/upnp_context.cpp
@@ -26,7 +26,7 @@
 #include <asio/steady_timer.hpp>
 #include <fmt/std.h>
 
-namespace jami {
+namespace dhtnet {
 namespace upnp {
 
 constexpr static auto MAP_UPDATE_INTERVAL = std::chrono::seconds(30);