LU-6142 o2iblnd: remove some unused fields.

LU-6142 o2iblnd: remove some unused fields.

Fields kib_min_reconnect_interval kib_max_reconnect_interval kib_ntx
are never used or set.

ibh_mr_shift is set but never used;
rx_status is used (in a debug message) but never set.

Remove them all.

We could possibly remove ibh_mr_size too. It is only used
for an error message.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.com>
Change-Id: If1ff73c15f8e712be4e3d77e9572a4d4e741c75d
Reviewed-on: https://review.whamcloud.com/35891
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Arshad Hussain <arshad.super@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>