Add the restoreLedsAssert method for LED manager

- Logically, Since the physical LEDs states should not be operated
  during the lamp test, all the physical LEDs states before and
  during the lamp test should be saved and restored after the lamp
  test.

Tested:
- Store the state of all the physical LEDs before the lamp test,
  and keep the state of all the physical LEDs consistent after
  the lamp test.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I8b321bae2e38001ea33a80bda8badcf4c8a55040
7 files changed