tests: Read binary file in add_log_file() for python3

python3 requires sqlite3.Binary() input to be bytes instead of str, so
open the files for binary mode reading.

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/hwsim/run-tests.py

@@ -84,7 +84,7 @@ def add_log_file(conn, test, run, type, path):
     if not os.path.exists(path):
         return
     contents = None
-    with open(path, 'r') as f:
+    with open(path, 'rb') as f:
         contents = f.read()
     if contents is None:
         return