Print out error message of docker commands

This print out error message of docker commands to find out the
reason of error like[1]

[1] https://build.opnfv.org/ci/job/daisy-build-daily-master/239/consoleFull

Change-Id: Ic1bd85d999dbe584764bc9a05d22579835e55516
Signed-off-by: Zhijiang Hu <hu.zhijiang@zte.com.cn>

diff --git a/ci/build_rpm/build_rpms.sh b/ci/build_rpm/build_rpms.sh
index db5a42e..e4b0cae 100755 (executable)
--- a/ci/build_rpm/build_rpms.sh
+++ b/ci/build_rpm/build_rpms.sh
@@ -36,9 +36,9 @@ function cleanup_container {
             ${containers_to_kill} | egrep -v '(^\s*$)' | sort | uniq)
 
         echo "Stopping containers... $containers_to_kill"
-        (sudo docker stop -t 2 ${containers_to_kill} 2>&1) > /dev/null
+        sudo docker stop -t 2 ${containers_to_kill}
         echo "Removing containers... $containers_to_kill"
-        (sudo docker rm -v -f ${containers_to_kill} 2>&1) > /dev/null
+        sudo docker rm -v -f ${containers_to_kill}
 
         if [[ ! -z "$volumes_to_remove" ]]; then
             echo "Removing volumes... $volumes_to_remove"