tenant: open file to send utf-8 encoded

Was by mistake changed to byte encoding in 2ba03e9

Signed-off-by: Thore Sommer <[email protected]>

keylime/tenant.py

@@ -357,7 +357,7 @@ def init_add(self, args):
                 else:
                     raise UserError("Invalid file payload provided")
             else:
-                with open(args["file"], 'rb') as f:
+                with open(args["file"], encoding="utf-8") as f:
                     contents = f.read()
             ret = user_data_encrypt.encrypt(contents)
             self.K = ret['k']