MINOR: add option to ignore socket failures on start #546

Job	Run time
HAProxy check commit message	0s
generate-models	1m 9s
generate-specification	43s
license-check	21s
golangci-lint	1m 0s
lint-spec	7s
Build	27s
go mod tidy	8s
Tests	2m 47s
e2e on HAProxy (2.1)	44s
e2e on HAProxy (2.2)	43s
e2e on HAProxy (2.3)	44s
e2e on HAProxy (2.4)	44s
e2e on HAProxy (2.5)	46s
e2e on HAProxy (2.6)	40s
e2e on HAProxy (2.7)	46s
e2e on HAProxy (2.8)	46s
	12m 35s

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