http: fix request with option timeout and agent

When request with both timeout and agent, timeout not
work. This patch will fix it, socket timeout will set
to request timeout before socket is connected, and
socket timeout will reset to agent timeout after
response end.

Fixes: https://github.com/nodejs/node/issues/21185

PR-URL: https://github.com/nodejs/node/pull/21204


Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>