Fixes unit test for data directory

Author: mixacha

spec/unit/defines/server/config_entry_spec.rb

@@ -89,7 +89,7 @@
   end
 
   context "data_directory" do
-    let(:params) {{ :ensure => 'present', :name => 'data_directory', :value => '/var/pgsql' }}
+    let(:params) {{ :ensure => 'present', :name => 'data_directory_spec', :value => '/var/pgsql' }}
 
     it 'stops postgresql and changes the data directory' do
       is_expected.to contain_exec('postgresql_data_directory')