Add workaround for AUFS backend issue with postgresql

PostgreSQL may fail at startup with /etc/ssl/private/ssl-cert-snakeoil.key
permission denied.

This is due to a limitation of the AUFS backend which can be worked
around by recreating the /etc/ssl/private directory.

Ref to gavodachs/docker-dachs#1 for
the actual bug and moby/moby#783 for
more details on the AUFS issue.

Change-Id: I0afe01e880f4ace4a38d3751a8c621c97d97d658

Dockerfile

@@ -45,6 +45,11 @@ RUN export DEBIAN_FRONTEND=noninteractive && \
     apt-get install -y lava-tool lava-dispatcher lava-coordinator && \
     apt-get install -y apache2
 
+# Fix for AUFS bug on permissions, ref to https://github.com/docker/docker/issues/783
+# Which causes postgres to fail: ref to https://github.com/chbrandt/docker-dachs/issues/1
+# We simply move back and forth the /etc/ssl/private dir
+RUN mv /etc/ssl/private /etc/ssl/private.fixaufs && mv /etc/ssl/private.fixaufs /etc/ssl/private
+
 RUN service postgresql start && \
     export DEBIAN_FRONTEND=noninteractive && \
     apt-get install -y lava-server && \