Drop EOL Python 2 acceptance tests

Puppetboard supports only Python 3.

spec/acceptance/class_spec.rb

@@ -8,31 +8,6 @@
     apache_conf_file = '/etc/apache2/conf-enabled/puppetboard.conf'
   end
 
-  context 'default parameters' do
-    it 'works with no errors' do
-      pp = <<-EOS
-      if $facts['os']['family'] == 'RedHat' {
-        include epel
-      }
-      class { '::puppetboard':
-        manage_git        => true,
-        manage_virtualenv => true,
-      }
-      EOS
-
-      # Run it twice and test for idempotency
-      apply_manifest(pp, catch_failures: true)
-      apply_manifest(pp, catch_changes: true)
-    end
-
-    # TODO: get this working
-    # it 'should not answer to localhost' do
-    #  shell("/usr/bin/curl localhost:80", :acceptable_exit_codes => 7) do |r|
-    #    r.exit_code.should == 7 # curl (7): Couldn't connect to host
-    #  end
-    # end
-  end
-
   context 'configuring Apache / mod_wsgi' do
     it 'works with no errors' do
       pp = <<-EOS