MINOR: bind: add tcp-md5sig parameter #1025

Job	Run time
generate-specification	48s
generate-models	1m 29s
HAProxy check commit message	-1s
golangci-lint	0s
Tests	0s
lint-spec	0s
license-check	0s
go mod tidy	0s
Test equal	0s
e2e on HAProxy	0s
Build	0s
	2m 16s

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