Preserve path for cluster server endpoints (fixes virtctl with Rancher)

Signed-off-by: Sean Knight <git@seanknight.com>

staging/src/kubevirt.io/client-go/kubecli/vmi.go

@@ -27,6 +27,7 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/url"
+	"path"
 	"strconv"
 	"strings"
 	"time"
@@ -147,7 +148,10 @@ func RequestFromConfig(config *rest.Config, resource, name, namespace, subresour
 		return nil, fmt.Errorf("Unsupported Protocol %s", u.Scheme)
 	}
 
-	u.Path = fmt.Sprintf("/apis/subresources.kubevirt.io/%s/namespaces/%s/%s/%s/%s", v1.ApiStorageVersion, namespace, resource, name, subresource)
+	u.Path = path.Join(
+		u.Path,
+		fmt.Sprintf("/apis/subresources.kubevirt.io/%s/namespaces/%s/%s/%s/%s", v1.ApiStorageVersion, namespace, resource, name, subresource),
+	)
 	req := &http.Request{
 		Method: http.MethodGet,
 		URL:    u,