acceptance tests: use the default version of postgresql

Version 9.4 doesn't exist in the postgresql.org repos anymore, which
caused this test to fail. Simply using the default version that the
puppetlabs-postgresql module wants works fine.

Author: kenyon

spec/acceptance/default_parameters_spec.rb

@@ -7,11 +7,6 @@ class { 'java':
         distribution => 'jre',
       }
 
-      class { 'postgresql::globals':
-        manage_package_repo => true,
-        version             => '9.4',
-      }
-
       class { 'postgresql::server': }
 
       postgresql::server::db { 'jira':