hook: give exthooks tags for blocking time
The ui.system autogenerated tag isn't really useful - as they're named, let's
use the name the user gave us.
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