obsstore: prefetch struct.calcsize
This function is widely used and worth but be at module level. No specific
performance boost is visible, but this is more consistent.
FROM fedora:20
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