Remove precise-common Dockerfile OPS-1849

docker/build/precise-common/Dockerfile

-FROM ubuntu:precise 
-MAINTAINER edxops 
-
-# Set locale to UTF-8 which is not the default for docker.
-# See the links for details:
-# http://jaredmarkell.com/docker-and-locales/
-# https://github.com/docker-library/python/issues/13
-# https://github.com/docker-library/python/pull/14/files
-RUN apt-get update &&\
-    apt-get install -y locales &&\
-    locale-gen en_US.UTF-8
-ENV LANG en_US.UTF-8
-ENV LANGUAGE en_US:en
-ENV LC_ALL en_US.UTF-8
-
-ENV ANSIBLE_REPO="https://github.com/edx/ansible"
-ENV CONFIGURATION_REPO="https://github.com/edx/configuration.git"
-ENV CONFIGURATION_VERSION="master"
-
-ADD util/install/ansible-bootstrap.sh /tmp/ansible-bootstrap.sh
-RUN chmod +x /tmp/ansible-bootstrap.sh
-RUN /tmp/ansible-bootstrap.sh