BUG/MINOR: be less restrictive when looking for a leaf certificate #1042

Job	Run time
generate-models	1m 36s
generate-specification	11s
HAProxy check commit message	-1s
Build	-1s
license-check	-1s
golangci-lint	-1s
go mod tidy	-1s
lint-spec	-1s
Tests	0s
Test equal	0s
e2e on HAProxy	0s
	1m 41s

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