puppet: Fix use of under-scoped variables.

puppet/zulip/manifests/base.pp

@@ -23,7 +23,7 @@ class zulip::base {
                      ]
   package { $base_packages: ensure => "installed" }
 
-  $release_name = $operatingsystemrelease ? {
+  $release_name = $::operatingsystemrelease ? {
     # Debian releases
     /7.[0-9]*/ => 'wheezy',
     /8.[0-9]*/ => 'jessie',

puppet/zulip/manifests/postfix_localmail.pp

@@ -1,10 +1,10 @@
 class zulip::postfix_localmail {
   $postfix_packages = [ "postfix", ]
 
-  if $fqdn == '' {
+  if $::fqdn == '' {
     fail("Your system does not have a fully-qualified domain name defined. See hostname(1).")
   }
-  $postfix_mailname = zulipconf("postfix", "mailname", $fqdn)
+  $postfix_mailname = zulipconf("postfix", "mailname", $::fqdn)
   package { $postfix_packages:
     ensure => "installed",
     require => File['/etc/mailname'],
@@ -18,7 +18,7 @@ class zulip::postfix_localmail {
     mode    => '0644',
     owner   => root,
     group   => root,
-    content => $fqdn,
+    content => $::fqdn,
   }
 
   file {'/etc/postfix/main.cf':

puppet/zulip/manifests/supervisor.pp

@@ -7,7 +7,7 @@ class zulip::supervisor {
   # don't want/need supervisor to be started/stopped
   # /bin/true is used as a decoy command, to maintain compatibility with other
   # code using the supervisor service.
-  if $ignoreSupervisorService != undef and $ignoreSupervisorService {
+  if $::ignoreSupervisorService != undef and $::ignoreSupervisorService {
     service { "supervisor":
       ensure     => running,
       require    => [