Support for OracleLinux

[brontide]

Being a rebuild of RH it's a simple matter of patching config.pp.

--- config.pp.bak	2017-01-17 13:15:40.681058922 -0500
+++ config.pp	2017-01-17 13:16:06.890730918 -0500
@@ -38,7 +38,7 @@
 
   # Operating system specific configuration
   case $::operatingsystem {
-    /^(RedHat|CentOS|Scientific)$/: {
+    /^(RedHat|CentOS|Scientific|OracleLinux)$/: {
       # Not using firewalld by now
       file { '00-firewalld.conf':
         ensure  => 'absent',