Add kubeconfig path for IBM Managed OpenShift (#810)

IBM Managed OpenShift seems to use "/etc/kubernetes/kubelet-kubeconfig"
instead of the traditional "/var/lib/kubelet/kubeconfig" kubelet config
path.

Other changes:
  - fix a crash when kubelet's kubeconfig is not found and in-cluster
    config is used instead

Resolves: OCPBUGS-19795

Co-authored-by: Jiri Mencak <jmencak@users.noreply.github.com>

assets/tuned/manifests/ds-tuned.yaml

@@ -44,6 +44,10 @@ spec:
         - mountPath: /etc/sysconfig
           name: etc-sysconfig
           mountPropagation: HostToContainer
+        - mountPath: /etc/kubernetes
+          name: etc-kubernetes
+          mountPropagation: HostToContainer
+          readOnly: true
         - mountPath: /etc/sysctl.d
           name: etc-sysctl-d
           mountPropagation: HostToContainer
@@ -96,6 +100,10 @@ spec:
           path: /etc/sysconfig
           type: Directory
         name: etc-sysconfig
+      - hostPath:
+          path: /etc/kubernetes
+          type: Directory
+        name: etc-kubernetes
       - hostPath:
           path: /etc/sysctl.d
           type: Directory

pkg/tuned/controller.go

@@ -86,9 +86,6 @@ const (
 	wqKindDaemon  = "daemon"
 	wqKindTuned   = "tuned"
 	wqKindProfile = "profile"
-
-	// path to kubelet kubeconfig
-	kubeletKubeconfigPath = "/var/lib/kubelet/kubeconfig"
 )
 
 // Types
@@ -186,6 +183,21 @@ func parseCmdOpts() {
 
 // Get a client from kubelet's kubeconfig to write to the Node object.
 func getKubeClient() (kubernetes.Interface, error) {
+	var (
+		// paths to kubelet kubeconfig
+		kubeletKubeconfigPaths = []string{
+			"/var/lib/kubelet/kubeconfig",        // traditional OCP
+			"/etc/kubernetes/kubelet-kubeconfig", // IBM Managed OpenShift, see OCPBUGS-19795
+		}
+		kubeletKubeconfigPath string
+	)
+
+	for _, kubeletKubeconfigPath = range kubeletKubeconfigPaths {
+		if _, err := os.Stat(kubeletKubeconfigPath); err == nil {
+			break
+		}
+	}
+
 	config, err := clientcmd.BuildConfigFromFlags("", kubeletKubeconfigPath)
 	if err != nil {
 		return nil, err
@@ -1006,6 +1018,10 @@ func (c *Controller) updateTunedProfile() (err error) {
 	}
 
 	node, err := c.getNodeForProfile(getNodeName())
+	if err != nil {
+		return err
+	}
+
 	if node.ObjectMeta.Annotations == nil {
 		node.ObjectMeta.Annotations = map[string]string{}
 	}