misc: rename namespace jami to namespace dhtnet

Change-Id: I904ec8fa1f35dfdcf1aabd5f1ec8d95989ad0696
diff --git a/include/certstore.h b/include/certstore.h
index 289d400..1f85000 100644
--- a/include/certstore.h
+++ b/include/certstore.h
@@ -188,4 +188,4 @@
 };
 
 } // namespace tls
-} // namespace jami
+} // namespace dhtnet