color: move 'write-err' logic to the core ui class
This is similar to what we needed for 'write', we move the logic from the
extension to the core class. Beside the dispatch to 'win32print', we just apply
label to the argument.
FROM centos:centos6
RUN yum install -y gcc
RUN yum install -y python-devel python-docutils
RUN yum install -y make
RUN yum install -y rpm-build
RUN yum install -y gettext
RUN yum install -y tar
# For creating repo meta data
RUN yum install -y createrepo