Allow to configure timeout for k8s client

It would be helpful to have a possibility to configure Timeout
field, as well as others allowed.

Change-Id: I1e0e895b7ca6a17e86a6ad36f405e2538775cbbb
Closes: #553
Signed-off-by: Ruslan Aliev <raliev@mirantis.com>

pkg/k8s/utils/utils.go

@@ -30,12 +30,26 @@ import (
 	"opendev.org/airship/airshipctl/pkg/document"
 )
 
+// ClientOption is a function that allows to modify ConfigFlags object which is used to create Client
+type ClientOption func(*genericclioptions.ConfigFlags)
+
+// SetTimeout sets Timeout option in ConfigFlags object
+func SetTimeout(timeout string) ClientOption {
+	return func(co *genericclioptions.ConfigFlags) {
+		*co.Timeout = timeout
+	}
+}
+
 // FactoryFromKubeConfig returns a factory with the
 // default Kubernetes resources for the given kube config path and context
-func FactoryFromKubeConfig(path, context string) cmdutil.Factory {
+func FactoryFromKubeConfig(path, context string, opts ...ClientOption) cmdutil.Factory {
 	kf := genericclioptions.NewConfigFlags(false)
 	kf.KubeConfig = &path
 	kf.Context = &context
+	for _, o := range opts {
+		o(kf)
+	}
+
 	return cmdutil.NewFactory(cmdutil.NewMatchVersionFlags(&factory.CachingRESTClientGetter{
 		Delegate: kf,
 	}))

pkg/k8s/utils/utils_test.go

@@ -29,7 +29,7 @@ import (
 func TestDefaultManifestFactory(t *testing.T) {
 	bundle, err := document.NewBundleByPath("testdata/source_bundle")
 	require.NoError(t, err)
-	mapper, err := FactoryFromKubeConfig("testdata/kubeconfig.yaml", "").ToRESTMapper()
+	mapper, err := FactoryFromKubeConfig("testdata/kubeconfig.yaml", "", SetTimeout("30s")).ToRESTMapper()
 	require.NoError(t, err)
 	reader := DefaultManifestReaderFactory(false, bundle, mapper)
 	require.NotNil(t, reader)