BUG/MINOR: compression direction both not supported #543

Job	Run time
HAProxy check commit message	0s
generate-models	1m 9s
generate-specification	46s
lint-spec	7s
license-check	32s
Build	23s
golangci-lint	57s
go mod tidy	8s
Tests	3m 9s
e2e on HAProxy (2.1)	45s
e2e on HAProxy (2.2)	42s
e2e on HAProxy (2.3)	47s
e2e on HAProxy (2.4)	41s
e2e on HAProxy (2.5)	43s
e2e on HAProxy (2.6)	42s
e2e on HAProxy (2.7)	42s
e2e on HAProxy (2.8)	44s
	12m 57s

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