feat(upgradability): Reintroducing handshake #3290
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This PR is the 3rd step (version 36) as proposed in #3289.
Note: Merge after 2nd step is deployed (#3157)
Test plan
pytest/tests/sanity/upgradable.py and tests/sanity/backward_compatible.py should pass using as stable branch #3157
nayduck run: http://nayduck.eastus.cloudapp.azure.com:3000/#/run/318