feat(shell): add timeout warning and faster update

see #990

bumblebee_status/util/cli.py

@@ -52,7 +52,19 @@ def execute(
         raise RuntimeError("{} not found".format(cmd))
 
     if wait:
-        out, _ = proc.communicate()
+        timeout = 60
+        try:
+            out, _ = proc.communicate(timeout=timeout)
+        except subprocess.TimeoutExpired as e:
+            logging.warning(
+                f"""
+                Communication with process pid={proc.pid} hangs for more
+                than {timeout} seconds.
+                If this is not expected, the process is stale, or
+                you might have run in stdout / stderr deadlock.
+                """
+            )
+            out, _ = proc.communicate()
         if proc.returncode != 0:
             err = "{} exited with code {}".format(cmd, proc.returncode)
             logging.warning(err)