Correctly read the cache key for remote cache

[oulgen]

Summary: While investigating why we were calling put each time, I noticed that memcache backend returns a list instead of direct result, which means that we were correctly fetching the cached result but not using it.

Test Plan: The test should now work as expected

Differential Revision: D54500851

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @peterbell10 @ipiszy @yf225 @chenyang78 @kadeng @muchulee8 @aakhundov @ColinPeppler @amjames @desertfire @chauhang

[pytorch-bot]

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✅ You can merge normally! (3 Unrelated Failures)

As of commit 14147c6 with merge base 26431db ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• inductor / cuda12.1-py3.10-gcc9-sm86 / test (dynamic_inductor_huggingface, 1, 1, linux.g5.4xlarge.nvidia.gpu) (gh)
  DebertaForQuestionAnswering
• inductor / cuda12.1-py3.10-gcc9-sm86 / test (inductor_huggingface, 1, 1, linux.g5.4xlarge.nvidia.gpu) (gh)
  DebertaForQuestionAnswering
• pull / linux-focal-cuda12.1-py3.10-gcc9-sm86 / test (default, 3, 5, linux.g5.4xlarge.nvidia.gpu) (gh)
  inductor/test_triton_kernels.py::KernelTests::test_triton_kernel_equal_to_1_arg_dynamic_False

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54500851

[facebook-github-bot]

@pytorchbot merge -f 'Landed internally'

(Initiating merge automatically since Phabricator Diff has merged, using force because this PR might not pass merge_rules.json but landed internally)

[pytorchmergebot]

Merge started

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