test/components/util: add default retry interval and timeout

So other test packages don't have to specify their own explicitly, but
they can just re-use default ones, if they suite the test case.

Signed-off-by: Mateusz Gozdek <mateusz@kinvolk.io>

test/components/util/util.go

@@ -36,6 +36,16 @@ import (
 	"k8s.io/client-go/transport/spdy"
 )
 
+const (
+	// RetryInterval is the default retry interval for tests using retry strategy, so they
+	// don't have to specify their own local intervals.
+	RetryInterval = time.Second * 5
+
+	// Timeout is the default timeout for tests using retry strategy, so they
+	// don't have to specify their own local timeouts.
+	Timeout = time.Minute * 5
+)
+
 func KubeconfigPath(t *testing.T) string {
 	kubeconfig := os.ExpandEnv(os.Getenv("KUBECONFIG"))