test: add support for expecting dump failures

We'll use this in the next patch when testing the creds comparison for
threads.

v2: use an explicit list in zdtm.sh instead of a file in the test dir
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -345,6 +345,9 @@ apparmor
 seccomp_strict
 "
 
+TEST_EXPECTED_FAILURE="
+"
+
 CRIU_CPT=$CRIU
 TMP_TREE=""
 SCRIPTDIR=`dirname $CRIU`/test
@@ -766,6 +769,11 @@ EOF
 		# with some error code, or checkpoint is complete but return
 		# code is non-zero because of post dump action.
 		if [ "$retcode" -ne 0 ] && [[ "$retcode" -ne 32 || -z "$dump_only" ]]; then
+			if echo $TEST_EXPECTED_FAILURE | grep -q $tname; then
+				echo "Got expected dump failure"
+				return 0
+			fi
+
 			if [ $BATCH_TEST -eq 0 ]; then
 				echo WARNING: $tname returned $retcode and left running for debug needs
 			else