Fixes https://emqx.atlassian.net/browse/EMQX-9656
See also https://github.com/emqx/ehttpc/pull/45
This fixes a race condition where the remote server would close the
connection before or during requests, and, depending on timing, an
`{error, normal}` response would be returned. In those cases, we
should just retry the request without using up "retry credits".
Thales Macedo Garitezi