Why I did it
Fix the build unstable issue caused by the kvm 9000 port is not ready to use in 2 seconds.
2022-09-02T10:57:30.8122304Z + /usr/bin/kvm -m 8192 -name onie -boot order=cd,once=d -cdrom target/files/bullseye/onie-recovery-x86_64-kvm_x86_64_4_asic-r0.iso -device e1000,netdev=onienet -netdev user,id=onienet,hostfwd=:0.0.0.0:3041-:22 -vnc 0.0.0.0:0 -vga std -drive file=target/sonic-6asic-vs.img,media=disk,if=virtio,index=0 -drive file=./sonic-installer.img,if=virtio,index=1 -serial telnet:127.0.0.1:9000,server
2022-09-02T10:57:30.8123378Z + sleep 2.0
2022-09-02T10:57:30.8123889Z + '[' -d /proc/284923 ']'
2022-09-02T10:57:30.8124528Z + echo 'to kill kvm: sudo kill 284923'
2022-09-02T10:57:30.8124994Z to kill kvm: sudo kill 284923
2022-09-02T10:57:30.8125362Z + ./install_sonic.py
2022-09-02T10:57:30.8125720Z Trying 127.0.0.1...
2022-09-02T10:57:30.8126041Z telnet: Unable to connect to remote host: Connection refused
How I did it
Waiting more time until the tcp port 9000 is ready, waiting for 60 seconds in maximum.
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