migrate to dhtnet namespace

Change-Id: I7143a010bd83e8cfa7a3c8c3072ed23f6f0ba8e3
diff --git a/src/ip_utils.cpp b/src/ip_utils.cpp
index 0b2ded5..2d8f098 100644
--- a/src/ip_utils.cpp
+++ b/src/ip_utils.cpp
@@ -50,7 +50,7 @@
 #endif
 #endif
 
-namespace jami {
+namespace dhtnet {
 
 std::string_view
 sip_strerror(pj_status_t code)