BUG-8422: Propagate enqueue time

BUG-8422: Propagate enqueue time

When we are replaying requests onto a connection we really want
to leave their enqueue times intact, so they time out properly.
This codepath is specific for the replay case, hence we do not
want to incur any waiting, either.

This patch introduces enqueueRequest() which does not wait for
the queue duration and audits code paths so they end up talking
to the right method -- either enqueueRequest() or sendRequest().

Change-Id: Ibf97dcc11e32d9ffa911c78ccf0448d6891a9cac
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit 17e4759c7561e09786a22210e43b5b32db45149e)