test/infamy: catch TimeoutError in curl() to allow retries

Python's urllib.request wraps OSError in URLError during the connection
phase, but NOT during response reading (getresponse()).  This means a
timeout that fires after the TCP handshake completes, e.g. when a service
accepts the connection but hasn't sent a response yet, propagates as a
bare TimeoutError that bypasses the exception handler, killing the entire
until() retry loop on the first attempt.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/infamy/util.py

@@ -116,7 +116,7 @@ def curl(url, timeout=10, silent=False):
     try:
         with urllib.request.urlopen(url, timeout=timeout) as response:
             return response.read().decode('utf-8', errors='replace')
-    except (urllib.error.URLError, ConnectionResetError, UnicodeEncodeError) as e:
+    except (urllib.error.URLError, ConnectionResetError, UnicodeEncodeError, TimeoutError) as e:
         if not silent:
             print(f"[WARN] curl: failed to fetch {url}: {e}")
         return ""