contrib/docker/centos7

clone: properly mark branches closed with --uncompressed (issue4428)

On streaming clone, we were priming the local branch cache with the
remote branchmap, without checking which heads were closed.

This fixes an issue introduced in:

 changeset:   17740:e6067bec18da
 user:        Tomasz Kleczek <[e-mail]>
 date:        Wed Oct 03 13:19:53 2012 -0700
 summary:     branchcache: fetch source branchcache during clone (issue3378)

that was exposed in 2.9 by:

 changeset:   20192:38fad5e76ee8
 user:        Brodie Rao <[e-mail]>
 date:        Mon Sep 16 01:08:29 2013 -0700
 summary:     branches: simplify with repo.branchmap().iterbranches()

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