largefiles: replace manifestdict.__contains__, don't extend class
We're soon going to add an alternative manifest class
(treemanifest). Rather than extending both those classes by
largesfiles versions, let's replace the method on the manifest
instances.
FROM centos:centos7
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