fix(cli): IsReachable check for "get values"

The 'helm get values' has its own Run() method in the action package.
So, unlike the other 'get' variants, it needs to check for the
reachability of the cluster itself.

Signed-off-by: Marc Khouzam <marc.khouzam@montreal.ca>
(cherry picked from commit bf4cc97bbe)

pkg/action/get_values.go

@@ -39,6 +39,10 @@ func NewGetValues(cfg *Configuration) *GetValues {
 
 // Run executes 'helm get values' against the given release.
 func (g *GetValues) Run(name string) (map[string]interface{}, error) {
+	if err := g.cfg.KubeClient.IsReachable(); err != nil {
+		return nil, err
+	}
+
 	rel, err := g.cfg.releaseContent(name, g.Version)
 	if err != nil {
 		return nil, err