MINOR: global: add options tune.lua.log.loggers & stderr #446

Job	Run time
generate-specification	42s
generate-models	1m 22s
HAProxy check commit message	0s
lint-spec	10s
golangci-lint	1m 57s
go mod tidy	6s
Build	22s
Tests	2m 52s
e2e on HAProxy (2.1)	41s
e2e on HAProxy (2.2)	39s
e2e on HAProxy (2.3)	46s
e2e on HAProxy (2.4)	41s
e2e on HAProxy (2.5)	43s
e2e on HAProxy (2.6)	40s
e2e on HAProxy (2.7)	43s
e2e on HAProxy (2.8)	40s
	13m 4s

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