(release/v1.2) Fix(Dgraph): Add a lock to backups to process one requ… #6341
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…est at a time.
It's possible that two requests reach the server around the same time
and send a requests to the alphas with the same backupNum. This could
lead to issues further down the line.
Related to DGRAPH-2295
(cherry picked from commit 5b79260)
This change is
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