Add hashibot configuration for transferring issues

The added configuration will allow us to transfer open remote-plugin/* issues from
hashicorp/packer to their new respective repos. HashiBot issue transfer
only works with orgs it has write access to. Which is similar to how
GitHub's issue transfer feature works.

.hashibot.hcl

@@ -22,3 +22,21 @@ poll "closed_issue_locker" "locker" {
     If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.
   EOF
 }
+
+poll "label_issue_migrater" "remote_plugin_migrater" {
+  schedule                = "0 20 * * * *"
+  new_owner               = "hashicorp"
+  repo_prefix             = "packer-plugin-"
+  label_prefix            = "remote-plugin/"
+  excluded_label_prefixes  = ["communicator/"]
+  excluded_labels         = ["build", "core", "new-plugin-contribution", "website"]
+
+  issue_header     = <<-EOF
+    _This issue was originally opened by @${var.user} as ${var.repository}#${var.issue_number}. It was migrated here as a result of the [Packer plugin split](###blog-post-url###). The original body of the issue is below._
+
+    <hr>
+
+    EOF
+  migrated_comment = "This issue has been automatically migrated to ${var.repository}#${var.issue_number} because it looks like an issue with that plugin. If you believe this is _not_ an issue with the plugin, please reply to ${var.repository}#${var.issue_number}."
+}
+

main.go

@@ -152,7 +152,7 @@ func wrappedMain() int {
 	// passed into commands like `packer build`
 	config, err := loadConfig()
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error loading configuration: \n\n%s\n", err)
+		fmt.Fprintf(os.Stdout, "%s Error loading configuration: \n\n%s\n", ErrorPrefix, err)
 		return 1
 	}
 
@@ -166,7 +166,7 @@ func wrappedMain() int {
 
 	cacheDir, err := packersdk.CachePath()
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error preparing cache directory: \n\n%s\n", err)
+		fmt.Fprintf(os.Stdout, "%s Error preparing cache directory: \n\n%s\n", ErrorPrefix, err)
 		return 1
 	}
 	log.Printf("[INFO] Setting cache directory: %s", cacheDir)
@@ -187,7 +187,7 @@ func wrappedMain() int {
 		// Set this so that we don't get colored output in our machine-
 		// readable UI.
 		if err := os.Setenv("PACKER_NO_COLOR", "1"); err != nil {
-			fmt.Fprintf(os.Stderr, "Packer failed to initialize UI: %s\n", err)
+			fmt.Fprintf(os.Stdout, "%s Packer failed to initialize UI: %s\n", ErrorPrefix, err)
 			return 1
 		}
 	} else {
@@ -202,13 +202,13 @@ func wrappedMain() int {
 			currentPID := os.Getpid()
 			backgrounded, err := checkProcess(currentPID)
 			if err != nil {
-				fmt.Fprintf(os.Stderr, "cannot determine if process is in "+
-					"background: %s\n", err)
+				fmt.Fprintf(os.Stdout, "%s cannot determine if process is in "+
+					"background: %s\n", ErrorPrefix, err)
 			}
 			if backgrounded {
-				fmt.Fprint(os.Stderr, "Running in background, not using a TTY\n")
+				fmt.Fprintf(os.Stdout, "%s Running in background, not using a TTY\n", ErrorPrefix)
 			} else if TTY, err := openTTY(); err != nil {
-				fmt.Fprintf(os.Stderr, "No tty available: %s\n", err)
+				fmt.Fprintf(os.Stdout, "%s No tty available: %s\n", ErrorPrefix, err)
 			} else {
 				basicUi.TTY = TTY
 				basicUi.PB = &packer.UiProgressBar{}
@@ -246,7 +246,7 @@ func wrappedMain() int {
 	}
 
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error executing CLI: %s\n", err)
+		fmt.Fprintf(os.Stdout, "%s Error executing CLI: %s\n", ErrorPrefix, err)
 		return 1
 	}