[action] [PR:17729] [arp_update]: Add timeout to ping6 command #17745
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Why I did it
It's possible for the ping6 command to hang indefinitely, which blocks the arp_update script from running.
Work item tracking
How I did it
Timeout the ping6 command to ensure that it never blocks arp_update from running
How to verify it
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
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