lint: don't lint vendor directory

Rakefile

@@ -16,4 +16,4 @@ PuppetLint.configuration.send('disable_class_inherits_from_params_class')
 PuppetLint.configuration.send('disable_class_parameter_defaults')
 PuppetLint.configuration.send('disable_documentation')
 PuppetLint.configuration.send('disable_single_quote_string_with_variables')
-PuppetLint.configuration.ignore_paths = ["spec/**/*.pp", "pkg/**/*.pp"]
+PuppetLint.configuration.ignore_paths = ["spec/**/*.pp", "pkg/**/*.pp", "vendor/**/*.pp"]