Pin Postgresql to 2.5

This patch could not be cherry-picked
b/c there is a merge conflict between
the branches on this file.

Change-Id: Ieb1517967b283199a4bb5209d6ed41bc65129689

.fixtures.yml

@@ -12,6 +12,8 @@ fixtures:
       repo: 'git://github.com/puppetlabs/puppetlabs-rabbitmq'
       ref: 'origin/2.x'
     'inifile':  'git://github.com/puppetlabs/puppetlabs-inifile'
-    'postgresql': 'git://github.com/puppetlabs/puppet-postgresql.git'
+    'postgresql':
+      repo: 'git://github.com/puppetlabs/puppet-postgresql.git'
+      ref:  '2.5.0'
   symlinks:
     "glance": "#{source_dir}"