Run mutations concurrently per predicate in Ludicrous mode

[lgalatin]

What version of Dgraph are you using?

20.03.1

Have you tried reproducing the issue with the latest release?

yes

What is the hardware spec (RAM, OS)?

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

Please see https://discuss.dgraph.io/t/dgraph-cant-idle-without-being-oomkilled-after-large-data-ingestion/6543

Expected behaviour and actual result.

[minhaj-shakeel]

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