Specify postgresql version on Jenkins slaves.

The fact built into the postgresql module cannot determine which version
of postgresql to use in all cases (eg on Oneiric hosts). To get around
this hardcode the version to '9.1' when a default is not found by the
upstream module.

Change-Id: If5e4e0d7325d1507353d907cab4539260c7d4bc0
Reviewed-on: https://review.openstack.org/20196
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins

manifests/slave.pp

@@ -175,14 +175,31 @@ class jenkins::slave(
       ],
     }
 
+    $no_postgresql_version = 'Unsupported OS!  Please check `postgres_default_version` fact.'
+    if $::postgres_default_version == $no_postgresql_version {
+      # Have a default postgres version if the postgresql module can't decide
+      # on a sane default for itself.
+      $postgresql_version = '9.1'
+    }
+    else {
+      $postgresql_version = $::postgres_default_version
+    }
+    class { 'postgresql::params':
+      version => $postgresql_version,
+    }
+
     class { 'postgresql::server':
       config_hash => {
         'postgres_password'      => 'insecure_slave',
         'manage_redhat_firewall' => false,
         'listen_addresses'       => '127.0.0.1',
       },
+      require     => Class['postgresql::params'],
+    }
+
+    class { 'postgresql::devel':
+      require => Class['postgresql::params'],
     }
-    include postgresql::devel
 
     postgresql::db { 'openstack_citest':
       user     => 'openstack_citest',