BUG/MEDIUM: fix runtime socket commands response parsing

We were not parsing correctly the response from the runtime command socket, and not detecting correctly the errors.
The consequence was that if a runtime command failed, we were not triggering a reload and that would lead to inconsistencies between the configuration and the runtime

Author: hdurand0710

pkg/haproxy/api/runtime.go

@@ -104,7 +104,7 @@ func (c *clientNative) runRaw(runtime runtime.Runtime, sb strings.Builder, backe
 	}
 	for i := range result {
 		if len(result[i]) > 5 {
-			switch result[i][1:5] {
+			switch result[i][0:4] {
 			case "[3]:", "[2]:", "[1]:", "[0]:":
 				logger.Errorf("[RUNTIME] [BACKEND] [SOCKET] backend %s', server slots adjustment ?", backendName)
 				logger.Tracef("[RUNTIME] [BACKEND] [SOCKET] backend %s: Error: '%s', server slots adjustment ?", backendName, result[i])