[Enhancement] creating a new error code for rule failures (aws-cloudf…

…ormation#379)

* temp

* adding new exit code for when a rule fails

* added integration test to validate error code for a failing test

* cleanup

* rebase + fix test

* removed unecessary double 0

guard/src/commands/validate/structured.rs

@@ -75,6 +75,7 @@ impl<'eval> StructuredEvaluator<'eval> {
                 if let Status::FAIL = eval_rules_file(rule, &mut root_scope, Some(&each.name))? {
                     self.exit_code = 19;
                 }
+
                 let root_record = root_scope.reset_recorder().extract();
                 let report = simplifed_json_from_root(&root_record)?;
                 file_report.combine(report);