Update ssh module to support RHEL.

Parameterizes the ssh module so that it supports both Ubuntu and
RHEL.

Change-Id: I9163e2f41d9a25df5f757592e642073fc19001f5
Reviewed-on: https://review.openstack.org/23299
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins

modules/ssh/manifests/init.pp

@@ -1,10 +1,11 @@
 # == Class: ssh
 #
 class ssh {
-    package { 'openssh-server':
+    include ssh::params
+    package { $::ssh::params::package_name:
       ensure => present,
     }
-    service { 'ssh':
+    service { $::ssh::params::service_name:
       ensure     => running,
       hasrestart => true,
       subscribe  => File['/etc/ssh/sshd_config'],

modules/ssh/manifests/params.pp

@@ -0,0 +1,19 @@
+# Class: ssh::params
+#
+# This class holds parameters that need to be
+# accessed by other classes.
+class ssh::params {
+  case $::osfamily {
+    'Redhat': {
+      $package_name = 'openssh-server'
+      $service_name = 'sshd'
+    }
+    'Debian', 'Ubuntu': {
+      $package_name = 'openssh-server'
+      $service_name = 'ssh'
+    }
+    default: {
+      fail("Unsupported osfamily: ${::osfamily} The 'ssh' module only supports osfamily Ubuntu or Redhat(slaves only).")
+    }
+  }
+}