Commits on Apr 26, 2021

1. Fix issue: exception occurred during chassis object being destroyed …

   The following error message is observed during chassis object being destroyed
   ```
   Exception ignored in: <function Chassis.__del__ at 0x7fd22165cd08>
   Traceback (most recent call last):
     File "/usr/local/lib/python3.7/dist-packages/sonic_platform/chassis.py", line 83, in __del__
   ImportError: sys.meta_path is None, Python is likely shutting down
   ```
   
   The chassis tries to import deinitialize_sdk_handle during being destroyed
   for the purpose of releasing the sdk_handle.
   However, to import another module during shutting down can causing error
   because some of the fundamental infrastructure is no longer available.
   
   To fix it, record the deinitialize_sdk_handle in chassis object when
   sdk_handle is being initialized and call the deinitialize handler when
   chassis object is being destroyed
   
   Signed-off-by: Stephen Sun <[email protected]>

   

   stephenxs committed Apr 26, 2021
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