tests: Format log printing according to E231 flake8 rule.

Without this when using Python 3.12 and flake8 5.0.4 the following
errors are flagged:
  tests/check_acl_log.py:97:25: E231 missing whitespace after ':'
  tests/check_acl_log.py:102:71: E231 missing whitespace after ':'

While this seems a bit too restrictive from flake8 we can easily work
around it by just not using f-strings unless necessary.

This unblocks GitHub CI runs.  These started failing since the Python
version we get in CI (Fedora container and Ubuntu host) changed to 3.12.

Signed-off-by: Dumitru Ceara <[email protected]>

tests/check_acl_log.py

@@ -94,12 +94,14 @@ def main():
                 print(
                     f"Expected log {key}={val} but got "
                     f"{key}={parsed_log[key]} "
-                    f"in:\n\t'{acl_log}'"
+                    "in:\n\t"
+                    f"'{acl_log}'"
                 )
                 exit(1)
         except KeyError:
             print(
-                f"Expected log {key}={val} but {key} does not exist in:\n"
+                f"Expected log {key}={val} but {key} "
+                "does not exist in:\n"
                 f"\t'{acl_log}'"
             )
             exit(1)