misc: rename namespace jami to namespace dhtnet

Change-Id: I904ec8fa1f35dfdcf1aabd5f1ec8d95989ad0696
diff --git a/include/generic_io.h b/include/generic_io.h
index 3ad9c80..67812c2 100644
--- a/include/generic_io.h
+++ b/include/generic_io.h
@@ -120,4 +120,4 @@
     GenericSocket() = default;
 };
 
-} // namespace jami
+} // namespace dhtnet