core: Rename "count" variables in context plan fixtures

This variable name is now reserved so we can support the count
meta-argument inside module blocks in a later release.

terraform/context_plan_test.go

@@ -265,7 +265,7 @@ func TestContext2Plan_moduleCycle(t *testing.T) {
 		ResourceTypes: map[string]*configschema.Block{
 			"aws_instance": {
 				Attributes: map[string]*configschema.Attribute{
-					"id": {Type: cty.String, Computed: true},
+					"id":         {Type: cty.String, Computed: true},
 					"some_input": {Type: cty.String, Optional: true},
 				},
 			},
@@ -1874,7 +1874,7 @@ func TestContext2Plan_countVar(t *testing.T) {
 			},
 		),
 		Variables: InputValues{
-			"count": &InputValue{
+			"instance_count": &InputValue{
 				Value:      cty.StringVal("3"),
 				SourceType: ValueFromCaller,
 			},

terraform/test-fixtures/plan-count-var/main.tf

@@ -1,10 +1,10 @@
-variable "count" {}
+variable "instance_count" {}
 
 resource "aws_instance" "foo" {
-    count = "${var.count}"
-    foo = "foo"
+  count = var.instance_count
+  foo   = "foo"
 }
 
 resource "aws_instance" "bar" {
-    foo = "${join(",", aws_instance.foo.*.foo)}"
+  foo = join(",", aws_instance.foo.*.foo)
 }

terraform/test-fixtures/plan-taint-interpolated-count/main.tf

@@ -1,7 +1,7 @@
-variable "count" {
+variable "instance_count" {
   default = 3
 }
 
 resource "aws_instance" "foo" {
-  count = "${var.count}"
+  count = "${var.instance_count}"
 }