http: add reusedSocket property on client request
Set reusedSocket property when reusing socket for request, so user can handle retry base on wether the request is reusing a socket.
Refs: https://github.com/request/request/issues/3131
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines