Fix resource leak bug in TCPStore constructor (#52860)
Summary:
This PR fixes a resource leakage bug in the constructor of `TCPStore` where an exception thrown in `TCPStoreDaemon` or `tcputil::connect()` can leave the server socket dangling. The ideal long-term solution would be to have a RAII wrapper for TCP sockets returned by `tcputil`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52860
Reviewed By: osalpekar
Differential Revision: D26671775
Pulled By: cbalioglu
fbshipit-source-id: ccebbd7533ac601a4b80e6e759f2fb4fe01c70fa
