test(inspec): replace serverspec with inspec tests

test/integration/default/controls/config_spec.rb

@@ -0,0 +1,10 @@
+control 'Postgres configuration' do
+  title 'should include the directory'
+
+  describe file('/srv/my_tablespace') do
+    it { should be_directory }
+    it { should be_owned_by 'postgres' }
+    it { should be_grouped_into 'postgres' }
+    its('mode') { should cmp '0700' }
+  end
+end