[CORE] Set ray client server host when starting ray.

[surenyufuz]

Description

When starting ray processes, we can use the flag --dashboard-host to set the host for the dashboard server to bind , either localhost (127.0.0.1) or 0.0.0.0.

So can we do the same thing with ray client server ? For example, add a flag which could be like --ray-client-server-host.

Currently, ray client server port could be set from node-ip-address.

For some security reasons, I should keep the node ip address which is not 127.0.0.1 and only set 127.0.0.1 for ray client server to bind. As far as I can see, ray client server is only used to be connected from users' scripts, set the host to 127.0.0.1 for it would not cause other problems.