Add timestamp to containers' build log

In order to ease investigation of failures for containers build,
add timestamp to stdout and stderr log files.

Change-Id: I59198457044326193593948ed8c780e24ccebbc4

playbooks/tripleo-buildcontainers/run.yaml

@@ -66,7 +66,7 @@
       args:
         chdir: '{{ workspace }}'
       shell: |
-        set -x
+        set -o pipefail
         source {{ workspace }}/venv/bin/activate
         TRIPLEO_COMMON_PATH="{{ openstack_git_root }}/tripleo-common"
 
@@ -79,7 +79,7 @@
             {% if use_buildah is defined and use_buildah %}
              --use-buildah \
             {% endif %}
-            > {{ workspace }}/build.log 2> {{ workspace }}/build-err.log
+            2>&1 {{ timestamper_cmd }} > {{ workspace }}/build.log
         RESULT=$?
         exit $RESULT
 

playbooks/tripleo-buildcontainers/vars/common.yaml

@@ -18,3 +18,6 @@ exclude_containers:
     - sensu-base
   yum:
     - opendaylight
+
+timestamper_cmd: >-
+    | awk '{ print strftime("%Y-%m-%d %H:%M:%S |"), $0; fflush(); }'