BUG/MINOR: add missing hash-balance-factor for defaults and backend #571

Job	Run time
HAProxy check commit message	0s
generate-models	1m 2s
generate-specification	44s
golangci-lint	1m 3s
license-check	43s
lint-spec	7s
Build	21s
go mod tidy	16s
Tests	2m 27s
e2e on HAProxy (2.1)	5s
e2e on HAProxy (2.2)	12s
e2e on HAProxy (2.3)	10s
e2e on HAProxy (2.4)	3s
e2e on HAProxy (2.5)	11s
e2e on HAProxy (2.6)	8s
e2e on HAProxy (2.7)	4s
e2e on HAProxy (2.8)	12s
	7m 48s

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