contrib/docker/fedora21

bundle2: prefix all bundling debug messages with 'bundle2-ouput:'

This makes the origin of the message more explicit.

FROM fedora:21
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
# For creating repo meta data
RUN yum install -y createrepo