contrib/docker/centos6

match: join two nested if-blocks

Instead of

  if a:
      if b:
          return False

let's write it

  if a and b:
      return False

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