Setting all the optimizers to have useLocking = True#310

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karllessard merged 3 commits intotensorflow:masterfrom

Craigacp:locking-optimizer-fixes

May 4, 2021

Commits on May 1, 2021

Setting all the optimizers to have useLocking = True, like Keras. Adding a determinism test that's currently failing.
Craigacp
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More work on the GradientDescentTest.
Craigacp
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Commits on May 4, 2021

Tidying up the test.
Craigacp
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