test(inspec): replace serverspec with inspec tests

test/integration/default/controls/services_spec.rb

@@ -0,0 +1,13 @@
+control 'Postgres service' do
+  impact 0.5
+  title 'should be running and enabled'
+
+  describe service('postgresql') do
+    it { should be_enabled }
+    it { should be_running }
+  end
+
+  describe port(5432) do
+    it { should be_listening }
+  end
+end