fix plancheck import

Author: shuyama1

mmv1/templates/terraform/samples/base_configs/test_file.go.tmpl

@@ -17,6 +17,13 @@
 
 package {{ $.Res.PackageName }}_test
 
+{{ $needsPlancheck := false }}
+{{ range $s := $.Res.TestSamples }}
+  {{ if gt (len $s.TestSteps) 1 }}
+    {{ $needsPlancheck = true }}
+  {{ end }}
+{{ end }}
+
 import (
 	"fmt"
 	"log"
@@ -26,8 +33,8 @@ import (
 	"time"
 
 	"github.com/hashicorp/terraform-plugin-testing/helper/resource"
-	"github.com/hashicorp/terraform-plugin-testing/plancheck"
-	"github.com/hashicorp/terraform-plugin-testing/terraform"
+{{ if $needsPlancheck }}	"github.com/hashicorp/terraform-plugin-testing/plancheck"
+{{ end }}	"github.com/hashicorp/terraform-plugin-testing/terraform"
 
 	"{{ $.ImportPath }}/acctest"
 	"{{ $.ImportPath  }}/envvar"