Adding SELinux work-around for precise.

docker/build/precise-common/Dockerfile

@@ -11,6 +11,16 @@ RUN useradd docker && echo "docker:docker" | chpasswd
 RUN echo "docker ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
 RUN mkdir -p /home/docker && chown -R docker:docker /home/docker
 RUN apt-get install -y python2.7 python2.7-dev python-pip python-apt python-yaml python-jinja2 git
+
+# Temporary hacking related to an SELinux bug.  This issue causes, at least,
+# useradd to fail silently when the -m flag is passed in.  The bug affects
+# Ubuntu precise and is tracked here:
+#
+# https://bugs.launchpad.net/ubuntu/+source/libselinux/+bug/1424795
+RUN apt-get install wget
+RUN wget http://mirrors.kernel.org/ubuntu/pool/main/libs/libselinux/libselinux1_2.2.2-1_amd64.deb && dpkg -i libselinux1_2.2.2-1_amd64.deb && rm -f libselinux1_2.2.2-1_amd64.deb
+# end hack
+
 USER docker
 
 # ansible bootstrap