Add EnsureComplete config check during phase apply call

There is need to check config object in scope of phase apply
function. Return an error if Config object is incomplete.

Change-Id: Ibd263375d5fb95810b885c77c4cfe605588eb308
Relates-To: #213
Closes: #213
Signed-off-by: Ruslan Aliev <raliev@mirantis.com>

pkg/phase/apply/apply.go

@@ -53,6 +53,10 @@ func (applyOptions *Options) Run() error {
 
 	globalConf := applyOptions.RootSettings.Config
 
+	if err = globalConf.EnsureComplete(); err != nil {
+		return err
+	}
+
 	kustomizePath, err := globalConf.CurrentContextEntryPoint(applyOptions.PhaseName)
 	if err != nil {
 		return err