BUG/MINOR: raw: read the raw config file in full on GET and POST #418

Job	Run time
HAProxy check commit message	0s
generate-models	1m 52s
generate-specification	42s
Build	25s
lint-spec	9s
golangci-lint	1m 46s
go mod tidy	11s
Tests	37s
e2e on HAProxy (2.1)	51s
e2e on HAProxy (2.2)	1m 30s
e2e on HAProxy (2.3)	1m 11s
e2e on HAProxy (2.4)	1m 10s
e2e on HAProxy (2.5)	1m 4s
e2e on HAProxy (2.6)	1m 9s
e2e on HAProxy (2.7)	1m 4s
	13m 41s

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