Test UpsertWithValueVar is flaky

Moved from GitHub dgraph/4571

Posted by pawanrawal:

What version of Dgraph are you using?

master

Have you tried reproducing the issue with the latest release?

yes

Steps to reproduce the issue (command/config used to run Dgraph).

This test failed without any related change https://teamcity.dgraph.io/viewLog.html?buildId=39620&buildTypeId=Dgraph_Ci&tab=buildResultsDiv

Expected behaviour and actual result.

It should not be flaky