TCP_NODELAY missing in outgoing connections

[sungming2]

This is a follow up issue from #1706 (comment)

The cluster bus initiates connections for node-to-node communication (e.g., Pub/Sub, PING/PONG..).
The absence of TCP_NODELAY can cause unnecessary latency due to Nagle’s algorithm (buffers small TCP packets), which should be disabled for traffic.

We need to consider enabling TCP_NODELAY by default