Sort IAM policy bindings by their role name to get simpler diffs as i…

…t's what the API does

google/data_source_google_iam_policy.go

@@ -2,6 +2,7 @@ package google
 
 import (
 	"encoding/json"
+	"sort"
 	"strconv"
 
 	"github.com/hashicorp/terraform/helper/hashcode"
@@ -103,6 +104,11 @@ func dataSourceGoogleIamPolicyRead(d *schema.ResourceData, meta interface{}) err
 		}
 	}
 
+	// Sort bindings by their role name to get simpler diffs as it's what the API does
+	sort.Slice(bindings, func(i, j int) bool {
+		return bindings[i].Role < bindings[j].Role
+	})
+
 	// Convert each audit_config into a cloudresourcemanager.AuditConfig
 	policy.AuditConfigs = expandAuditConfig(aset)