LU-8867 ksocklnd: ignore timedout TX on closing connection

LU-8867 ksocklnd: ignore timedout TX on closing connection

ksocklnd reaper thread always tries to close the connection for the
first timedout zero-copy TX. This is wrong if this connection is
already being closed, because the reaper will see the same TX again
and again and cannot find out other timedout zero-copy TXs and close
connections for them.

Change-Id: I4552f556f17910857e589a8ae27682d976fcd991
Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Reviewed-on: https://review.whamcloud.com/23973
Tested-by: Jenkins
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>