bmc: config: add skip action

If you specify the action for one of the three fields as "skip" it'll
create a handler object for that action that always returns success and
has no effect.  This action therefore "skips" the step, moving the state
machine forward as though it was a successful real action.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ib4c1091745eb96b8381a332bbeb0562625d3bfbe
diff --git a/bmc/skip_action.cpp b/bmc/skip_action.cpp
new file mode 100644
index 0000000..4392e97
--- /dev/null
+++ b/bmc/skip_action.cpp
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "skip_action.hpp"
+
+#include <memory>
+
+namespace ipmi_flash
+{
+
+std::unique_ptr<TriggerableActionInterface> SkipAction::CreateSkipAction()
+{
+    return std::make_unique<SkipAction>();
+}
+
+} // namespace ipmi_flash