Timeouts: Fix bugs in scsi task timeout code

Add a test to verify the pdu timeout handling.
Fix numerous bugs in the timeout handling. It was really broken.

Add test for non-SCSI task PDUs too and verify they works.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

tests/test_2100_timeout.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+. ./functions.sh
+
+echo "Basic iSCSI Timeout test"
+
+start_target
+create_lun
+
+echo -n "Test that timeouts trigger when we get no reply to an iSCSI PDU..."
+./prog_timeout -i ${IQNINITIATOR} iscsi://${TGTPORTAL}/${IQNTARGET}/1 || failure
+success
+
+shutdown_target
+delete_lun
+
+exit 0