[synchronous-mode] Add template file for synchronous mode#5644

Merged

shi-su merged 6 commits intosonic-net:masterfrom

shi-su:sync_template

Oct 23, 2020

Commits on Oct 16, 2020

add synchronous mode template file
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update orchagent.sh to use synchronous_mode.sh
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fix typo
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Combine template file and reduce sonic-cfggen usage
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update orchagent.sh
shi-su
committed

Commits on Oct 21, 2020

move swss_var.j2 to docker-config-engine
shi-su
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