fix docker build with new docker release

scripts/resolve-debbuilddeps.sh

@@ -16,7 +16,7 @@ if test -n "${SCHROOTNAME}"; then
   SUDO="schroot -c "${SCHROOTNAME}" -u root -d / --"
 else
   DO=""
-  if grep -q '/docker/' /proc/1/cgroup; then
+  if grep -q '/docker' /proc/1/cgroup; then
       SUDO=""
   else
       SUDO="sudo"