Added support for RHEL and did some syntax cleaning

Assume that "RedHat" also works where "CentOS" does.

ntpd/manifests/init.pp

@@ -15,9 +15,9 @@ class ntpd {
         $ntp_server = ["pool.ntp.org"]
     }
 
-    case $operatingsystem {
+    case $::operatingsystem {
         "fedora": {
-            case $operatingsystemrelease {
+            case $::operatingsystemrelease {
                 /^1[0-5]/: {
                     include ntpd::isc-ntpd
                 }
@@ -34,8 +34,8 @@ class ntpd {
         }
     }
 
-    case $operatingsystem {
-        "centos","fedora": {
+    case $::operatingsystem {
+        "centos","redhat","fedora": {
             augeas { "disable-peerntp":
                 context => "/files/etc/sysconfig/network",
                 changes => "set PEERNTP no",
@@ -93,7 +93,7 @@ class ntpd::isc-ntpd {
     service { "ntpd":
         ensure => running,
         enable => true,
-        name   => $operatingsystem ? {
+        name   => $::operatingsystem ? {
             ubuntu  => "ntp",
             debian  => "ntp",
             default => "ntpd",