cleanup: Move em only utils code into em directory

More separation of code for improvement of repository maintainability.

Change-Id: I4e77b472355066483cf646cdcd29e7ed660294a3
Signed-off-by: Christopher Meis <christopher.meis@9elements.com>
diff --git a/src/entity_manager/dbus_interface.cpp b/src/entity_manager/dbus_interface.cpp
index f0c904c..5c1788b 100644
--- a/src/entity_manager/dbus_interface.cpp
+++ b/src/entity_manager/dbus_interface.cpp
@@ -1,11 +1,12 @@
 #include "dbus_interface.hpp"
 
-#include "../utils.hpp"
 #include "perform_probe.hpp"
+#include "utils.hpp"
 
 #include <boost/algorithm/string/case_conv.hpp>
 #include <boost/container/flat_map.hpp>
 
+#include <fstream>
 #include <regex>
 #include <string>
 #include <vector>