Merge pull request #11219 from hashicorp/rename_slug_to_bucket

make user-facing name for slug be bucket_name

hcl2template/testdata/hcp_par/build-description.pkr.hcl

@@ -3,7 +3,7 @@ build {
 Some build description
     EOT
   hcp_packer_registry {
-    slug = "bucket-slug"
+    bucket_name = "bucket-slug"
   }
   sources = [
     "source.virtualbox-iso.ubuntu-1204",

hcl2template/testdata/hcp_par/override-build-description.pkr.hcl

@@ -3,7 +3,7 @@ build {
 Some build description
     EOT
   hcp_packer_registry {
-    slug = "bucket-slug"
+    bucket_name = "bucket-slug"
     description = <<EOT
 Some override description
     EOT

hcl2template/testdata/hcp_par/slug.pkr.hcl

@@ -2,7 +2,7 @@ build {
     name = "bucket-slug"
 
     hcp_packer_registry {
-        slug = "real-bucket-slug"
+        bucket_name = "real-bucket-slug"
         description = <<EOT
 Some description
     EOT

hcl2template/types.build.hcp_packer_registry.go

@@ -37,7 +37,7 @@ func (p *Parser) decodeHCPRegistry(block *hcl.Block) (*HCPPackerRegistryBlock, h
 	body := block.Body
 
 	var b struct {
-		Slug        string            `hcl:"slug,optional"`
+		Slug        string            `hcl:"bucket_name,optional"`
 		Description string            `hcl:"description,optional"`
 		Labels      map[string]string `hcl:"labels,optional"`
 		Config      hcl.Body          `hcl:",remain"`