(PDK-421) Update acceptance tests for EPP Validation

Previously in commit ea789ac the EPP validator was added however the
acceptance tests were failing.  This commit updates the acceptance test, adding
the missing validator name.

package-testing/spec/package/update_module_spec.rb

@@ -54,7 +54,7 @@
           subject { super().stdout.split("\n") }
 
           it 'does not output any unexpected errors' do
-            is_expected.to all(match(%r{^(?:info|warning|error): (?:puppet-lint|rubocop|task-metadata-lint|task-name)}))
+            is_expected.to all(match(%r{^(?:info|warning|error): (?:puppet-lint|rubocop|task-metadata-lint|task-name|puppet-epp)}))
           end
         end
       end