BUG/MEDIUM: client: add backups dir as an option to client #369

Job	Run time
generate-models	1m 18s
generate-specification	35s
HAProxy check commit message	0s
go mod tidy	13s
lint-spec	8s
Build	22s
golangci-lint	45s
Tests	48s
e2e on HAProxy (2.1)	59s
e2e on HAProxy (2.2)	1m 29s
e2e on HAProxy (2.3)	1m 1s
e2e on HAProxy (2.4)	1m 15s
e2e on HAProxy (2.5)	1m 6s
e2e on HAProxy (2.6)	1m 12s
e2e on HAProxy (2.7)	1m 1s
e2e on HAProxy (2.8)	1m 18s
	13m 30s

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