Updates return types in checker constructors

pkg/operator/controllers/checkers/clusterdnschecker/checker.go

@@ -20,7 +20,7 @@ type checker struct {
 	operatorcli operatorclient.Interface
 }
 
-func newClusterDNSChecker(operatorcli operatorclient.Interface) clusterDNSChecker {
+func newClusterDNSChecker(operatorcli operatorclient.Interface) *checker {
 	return &checker{
 		operatorcli: operatorcli,
 	}

pkg/operator/controllers/checkers/internetchecker/checker.go

@@ -26,7 +26,7 @@ type checker struct {
 	httpClient   simpleHTTPClient
 }
 
-func newInternetChecker() internetChecker {
+func newInternetChecker() *checker {
 	return &checker{
 		checkTimeout: time.Minute,
 		httpClient: &http.Client{

pkg/operator/controllers/checkers/serviceprincipalchecker/checker.go

@@ -26,7 +26,7 @@ type checker struct {
 	newSPValidator func(azEnv *azureclient.AROEnvironment) (dynamic.ServicePrincipalValidator, error)
 }
 
-func newServicePrincipalChecker(log *logrus.Entry, kubernetescli kubernetes.Interface) servicePrincipalChecker {
+func newServicePrincipalChecker(log *logrus.Entry, kubernetescli kubernetes.Interface) *checker {
 	tokenClient := aad.NewTokenClient()
 
 	return &checker{