rx: Add Karn-style backoffs to RX retransmits

rx: Add Karn-style backoffs to RX retransmits

When we retransmit a packet, we may be doing so because the RTT of the
connection has grown dramatically larger than earlier within the call.
However, RX doesn't permit all ACKs to retransmitted packets to be
counted within the RTT calculation.

So, adopt the same approach as Karn developed for TCP, and as described
in detail in RFC2988. When a retransmit event occurs, backoff the
connection RTT by doubling its value, and hold at this doubled value
until either another retransmit occurs (in which case we back off again,
up to a predetermined ceiling), or we receive an ACK packet which we
can use within the RTT calculation, in which case we drop back down to
the newly measured value.

This change replaces the per-packet backoff strategy originally
implemented in RX (which, whilst allowing resent packets more chance of
arriving, doesn't help with computing a correct RTT).

Reviewed-on: http://gerrit.openafs.org/4865
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 0118fb5387e656e515d78d48497a48f1e04a1152)

Change-Id: I697eac14f9b4be5c8726f0386e516cb49995f665
Reviewed-on: http://gerrit.openafs.org/4937
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>