migrate to dhtnet namespace

Change-Id: I7143a010bd83e8cfa7a3c8c3072ed23f6f0ba8e3
diff --git a/include/fileutils.h b/include/fileutils.h
index 6264af6..c2dcdc9 100644
--- a/include/fileutils.h
+++ b/include/fileutils.h
@@ -39,7 +39,7 @@
 #define DIR_SEPARATOR_STR_ESC "//*" // Escaped directory separator string
 #endif
 
-namespace jami {
+namespace dhtnet {
 namespace fileutils {
 
 /**