test_loggerd: make rotation test more robust (#31160)

* no randomness

* lots

* Revert "lots"

This reverts commit 2052fd6f7b8dc4c53fbb7c726026070918d5de00.

system/loggerd/tests/test_loggerd.py

@@ -152,8 +152,8 @@ class TestLoggerd:
       vipc_server.create_buffers_with_sizes(stream_type, 40, False, *(frame_spec))
     vipc_server.start_listener()
 
-    num_segs = random.randint(2, 5)
-    length = random.randint(1, 3)
+    num_segs = 3
+    length = 2
     os.environ["LOGGERD_SEGMENT_LENGTH"] = str(length)
     managed_processes["loggerd"].start()
     managed_processes["encoderd"].start()