misc: rename namespace jami to namespace dhtnet

Change-Id: I904ec8fa1f35dfdcf1aabd5f1ec8d95989ad0696
diff --git a/src/security/diffie-hellman.cpp b/src/security/diffie-hellman.cpp
index e15e418..78f901f 100644
--- a/src/security/diffie-hellman.cpp
+++ b/src/security/diffie-hellman.cpp
@@ -131,4 +131,4 @@
 }
 
 } // namespace tls
-} // namespace jami
+} // namespace dhtnet