rx: Remove packet burst elements from peer struct

rx: Remove packet burst elements from peer struct

The peer structure contains a number of elements left over from an
earlier, burst based, congestion control strategy. As OpenAFS has
never implemented this strategy, just remove these elements from
the structure, and store 0 values for these elements in the debug
packets.

Change-Id: Ib50a8ac587890efb483d3c2640ead615d170db34
Reviewed-on: http://gerrit.openafs.org/7006
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>