(maint) Fix mock stubs

This didn't work the way I expected it to at all. I've added an
explicit requirement for puppetlabs-stdlib so I can use the
capitalize() function when changing the mock settings instead.

Modulefile

@@ -11,3 +11,4 @@ project_page 'https://github.com/Whopper92/puppetlabs-rpmbuilder'
 dependency 'stahnma/epel', '>= 0.0.1'
 dependency 'stahnma/puppetlabs_yum', '>= 0.1.0'
 dependency 'puppetlabs/inifile', '>= 1.0.0'
+dependency 'puppetlabs/stdlib', '>= 3.0.0'

manifests/mock/cleanup.pp

@@ -3,35 +3,19 @@
   $on_failure = true,
 ) {
 
-
-  # Python is awesome, in that it's true and false boolean
-  # values are Camel-cased: True and False. Subsequently,
-  # any values you pass in to a boolean configuration options
-  # must respect the aforementioned camel-casing. Might be worth
-  # adding a camel method for strings into stdlib?
-  $failure = $on_failure ? {
-    /(?i:false)/ => 'False',
-    /(?i:true)/  => 'True',
-  }
-
-  $success = $on_success ? {
-    /(?i:false)/ => 'False',
-    /(?i:true)/  => 'True',
-  }
-
   ini_setting { "Cleanup on success":
     ensure  => present,
     path    => '/etc/mock/site-defaults.cfg',
     section => '',
     setting => "config_opts['cleanup_on_success']",
-    value   => $cleanup_on_success,
+    value   => capitalize("$on_success"),
   }
 
   ini_setting { "Cleanup on failure":
     ensure  => present,
     path    => '/etc/mock/site-defaults.cfg',
     section => '',
     setting => "config_opts['cleanup_on_failure']",
-    value   => $cleanup_on_failure,
+    value   => capitalize("$on_failure"),
   }
 }