Add plan with a fail-on-diff option.

- on exception, exit script with exit code > 0

src/main/python/ddadevops/devops_terraform_build.py

@@ -148,11 +148,13 @@ class DevopsTerraformBuild(DevopsBuild):
 
     def plan_fail_on_diff(self):
         tf = self.init_client()
-        tf.plan(detailed_exitcode=IsFlagged, capture_output=False, raise_on_error=False,
+        return_code = tf.plan(detailed_exitcode=IsFlagged, capture_output=False, raise_on_error=False,
                 var=self.project_vars(),
                 var_file=self.additional_tfvar_files)
         self.post_build()
         self.print_terraform_command(tf)
+        if (return_code > 0):
+            sys.exit(return_code)
 
 
     def apply(self, auto_approve=False):