<fix>[host]: reduce load.parallelismDegree default from 100 to 3

[MatheMatrix]

Root Cause

load.parallelismDegree=100 combined with reconnectAllOnBoot=true causes MN to fire ConnectHostMsg for all hosts simultaneously on boot. For environments with <100 hosts, this means full concurrent reconnect flood within 15ms, overwhelming the queue.

Fix

Reduce defaultValue from 100 to 3, limiting concurrent host reconnects to 3 per batch.

Resolves: ZSTAC-58095

sync from gitlab !10013

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