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[9.20] fix: usr: return SERVFAIL for a too long CNAME chain

bind-team-rw-api-rw-repo requested to merge backport-4449-return-servfail-for-a-long-cname-chain-9.20 into bind-9.20

When cutting a long CNAME chain, named was returning NOERROR instead of SERVFAIL (alongside with a partial answer). This has been fixed.

Closes #4449 (closed)

Backport of MR !9090 (merged)

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