MINOR: remove deprecated req_ssl_sni replaced with req.ssl_sni #1086

Job	Run time
generate-specification	53s
generate-models	1m 16s
HAProxy check commit message	0s
lint-spec	-1s
Build	-1s
go mod tidy	-1s
license-check	-1s
golangci-lint	-1s
Tests	0s
e2e on HAProxy	0s
	2m 4s

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