Revert D23009117: [Distributed] DeleteKey API for c10d TCP Store
Test Plan: revert-hammer
Differential Revision:
D23009117 (https://github.com/pytorch/pytorch/commit/addf94f2d6518666ef4b86007b098c1b0f864b44)
Original commit changeset: 1a0d95b43d79
fbshipit-source-id: ad3fe5501267e1a0a7bf23410766f1e92b34b24d
