OPNET-629: Use HAProxy monitor endpoint instead of API

This is the runtimecfg change corresponding to
openshift/machine-config-operator#4767
which switches the monitor call to the HAProxy endpoing rather than
call through to the API.

pkg/utils/utils.go

@@ -22,6 +22,7 @@ import (
 )
 
 const kubeClientTimeout = 30 * time.Second
+const haproxyHealthPort = 9454
 
 func FletcherChecksum8(inp string) uint8 {
 	var ckA, ckB uint8
@@ -67,19 +68,14 @@ func IsKubernetesHealthy(port uint16) (bool, error) {
 		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
 	}
 	client := &http.Client{Transport: transport}
-	resp, err := client.Get(fmt.Sprintf("https://localhost:%d/readyz", port))
+	resp, err := client.Get(fmt.Sprintf("http://localhost:%d/haproxy_monitor", haproxyHealthPort))
 	if err != nil {
 		return false, err
 	}
 	defer client.CloseIdleConnections()
 	defer resp.Body.Close()
 
-	body, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return false, err
-	}
-
-	return string(body) == "ok", nil
+	return resp.StatusCode == 200, nil
 }
 
 func AlarmStabilization(cur_alrm bool, cur_defect bool, consecutive_ctr uint8, on_threshold uint8, off_threshold uint8) (bool, uint8) {