Commits on Sep 21, 2023

1. Fix potentially not having any loopback address on lo interface (soni… …

   …c-net#16490)
   
   In sonic-net#15080, there was a command added to re-add 127.0.0.1/8 to the lo
   interface when the networking configuration is being brought down.
   However, the trigger for that command is `down`, which, looking at
   ifupdown2 configuration files, runs immediately after 127.0.0.1/16 is
   removed. This means there may be a period of time where there are no
   loopback addresses assigned to the lo interface, and redis commands will
   fail.
   
   Fix this by changing this to pre-down, which should run well before
   127.0.0.1/16 is removed, and should always leave lo with a loopback
   address.
   
   Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

   

   saiarcot895 authored and mssonicbld committed Sep 21, 2023
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