Make PackerBuildName and PackerBuilderType available as Facts during a...

Make PackerBuildName and PackerBuilderType available as Facts during a masterless run similar to the way we do with the Shell provisioner.

provisioner/puppet-masterless/provisioner.go

@@ -147,6 +147,8 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 		newFacts[k] = v
 	}
 
+	newFacts["packer_build_name"] = p.config.PackerBuildName
+	newFacts["packer_builder_type"] = p.config.PackerBuilderType
 	p.config.Facter = newFacts
 
 	// Validation

website/source/docs/provisioners/puppet-masterless.html.markdown

@@ -106,3 +106,17 @@ can contain various template variables, defined below:
 * `ModulePath` - The paths to the module directories.
 * `Sudo` - A boolean of whether to `sudo` the command or not, depending on
   the value of the `prevent_sudo` configuration.
+
+## Default Facts
+
+In addition to being able to specify custom Facter facts using the `facter`
+configuration, the provisioner automatically defines certain commonly useful
+facts:
+
+* `packer_build_name` is set to the name of the build that Packer is running.
+  This is most useful when Packer is making multiple builds and you want to
+  distinguish them in your Hiera hierarchy.
+
+* `packer_builder_type` is the type of the builder that was used to create the
+  machine that Puppet is running on. This is useful if you want to run only
+  certain parts of your Puppet code on systems built with certain builders.