travis-tests: add test for criu --help

Make sure travis/jenkins complain if someone sends a patch
that results in criu --help output violate standard terminal
width requirement.

Cc: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

scripts/travis/travis-tests

@@ -54,3 +54,10 @@ ip net add test
 
 pip install flake8
 make lint
+
+# Check that help output fits into 80 columns
+WIDTH=$(./criu/criu --help | wc --max-line-length)
+if [ "$WIDTH" -gt 80 ]; then
+	echo "criu --help output does not obey 80 characters line width!"
+	exit 1
+fi