Added support for RHEL and did some syntax cleaning

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

sysstat/manifests/init.pp

@@ -6,14 +6,14 @@ class sysstat {
     }
 
     case $::operatingsystem {
-        ubuntu: {
+        "ubuntu": {
             file { "/etc/default/sysstat":
                 ensure => present,
                 source => "puppet:///modules/sysstat/sysstat.default",
                 notify => Service["sysstat"],
             }
         }
-        centos,fedora: {
+        "centos","redhat","fedora": {
         }
         default: {
             fail("sysstat not supported on ${::operatingsystem}")