misc: rename namespace jami to namespace dhtnet

Change-Id: I904ec8fa1f35dfdcf1aabd5f1ec8d95989ad0696
diff --git a/include/turn_cache.h b/include/turn_cache.h
index c8d3684..f3617c9 100644
--- a/include/turn_cache.h
+++ b/include/turn_cache.h
@@ -108,4 +108,4 @@
     }
 };
 
-} // namespace jami
+} // namespace dhtnet