Add ntp-perl package for RedHat platforms

Since I29a101eb9ea5c2d0da6b7762fe93366f0c0a8999 we use ntp-wait, which
is part of the ntp-perl package on RedHat platforms, but included in
the base ntp package for others.  For consistency, add the ntp-perl
package here so we can assume the utility is everywhere.

I have submitted similar upstream (see Jira issue); we could revert
this if it gets accepted.

Change-Id: If59acfb2a950f74d8246424580be3b2bd1409ad3

modules/openstack_project/manifests/template.pp

@@ -27,7 +27,6 @@ class openstack_project::template (
   ###########################################################
   # Classes for all hosts
 
-  include ntp
   include snmpd
   include sudoers
 
@@ -231,6 +230,20 @@ class openstack_project::template (
     }
   }
 
+  ###########################################################
+  # Manage  ntp
+
+  include '::ntp'
+
+  if ($::osfamily == "RedHat") {
+    # Utils in ntp-perl are included in Debian's ntp package; we
+    # add it here for consistency.  See also
+    # https://tickets.puppetlabs.com/browse/MODULES-3660
+    package { 'ntp-perl':
+      ensure => present
+    }
+  }
+
   ###########################################################
   # Manage  python/pip