Fix data being replicated on VM's metadata file in the VR (#10987)

Author: GutoVeronezi

systemvm/debian/opt/cloud/bin/configure.py

@@ -908,6 +908,7 @@ def __createfile(self, ip, folder, file, data):
             if os.path.exists(metamanifest):
                 fh = open(metamanifest, "a+")
                 self.__exflock(fh)
+                fh.seek(0)
                 if file not in fh.read():
                     fh.write(file + '\n')
                 self.__unflock(fh)