Commits on Aug 28, 2024

1. Fix modify_single_file generate empty file issue (sonic-net#145) …

   Fix hostcfgd modify_single_file method generates empty file issue
   
   #### Why I did it
   Fix hostcfgd modify_single_file method generates empty file issue: sonic-net/sonic-buildimage#19748
   
   In the original code, there are 2 'mv' commands to backup and copy new file, if hostcfgd crash between those 2 commands, the original file will be removed, then when hostcfgd restart later, it will generate a empty file.
   
   The issue can be fix by use cp command.
   
   ##### Work item tracking
   - Microsoft ADO: 29064569
   
   #### How I did it
   Replace 'mv' command to 'cp' command
   
   #### How to verify it
   Manually verified.
   Pass all test case.
   
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   - [] SONiC.master-16482.360728-2c8b4066f
   
   #### Description for the changelog
   Fix hostcfgd modify_single_file method generates empty file issue
   
   #### Link to config_db schema for YANG module changes
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   liuh-80 authored and mssonicbld committed Aug 28, 2024
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