TWSD-115 [ANKK:HSOL-4015] / APV / WebAgent ttl value obtained from DNS server

Review Request #785 — Created April 10, 2025 and submitted — Latest diff uploaded

Information
peteryeh
APV10
rel_apv_10_7
TWSD-115
Reviewers
kevin.poh, tanya, timlai, weikai 
    

  1. Move TTL assginment to the end of the operation.
    2. 

  2. Add Failover to c-ares for 2nd DNS server
    3. 

  3. Removed ares_queue_wait_empty(), replace it with while loop to wait for callbacks.
    4. 

Tested in TW LAB and Japan SE Shinya's environment with primary DNS down.
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