[VS] Reset initial configuration such as "mac". (fixes #10269) #11808
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Why I did it
Default mac address is fixed one by SONiC-VS virtual machine based on same image.
It cause communicate error with multiple SONiC-VS virtual machines connection, such as BGP.
How I did it
On build time of sonic-vs.img, remove config_db.json and enable firsttime flag again.
How to verify it
Which release branch to backport (provide reason below if selected)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)