The test verifies the first line 43~51 bytes are "dashboard"
But due to recent code addition to head.py, the line where logs are written became 2 digits -> 3 digits
Previously,
2022-04-18 23:23:56,946 INFO head.py:[less than 100] -- Dashboard head grpc address: 127.0.0.1:57208
Now
2022-04-18 23:23:56,946 INFO head.py:101 -- Dashboard head grpc address: 127.0.0.1:57208
So we should increase the bytes range.
* Provide a utility to ping a Ray cluster and verify it has the same Ray version. This is useful to check if a Ray cluster is available at a given address, without connecting to the cluster with the more heavyweight ray.init(). This utility is integrated with ray memory to provide a better error message when the Ray cluster is unavailable. There seem to be user demand for exposing this as an API as well.
* Improve the error message when the address provided to Ray does not contain port.
