instack runs this script on a system where epel has already been
installed, which causes the yum command to fail. Only installing
the epel-release rpm when it isn't already present addresses the
issue.
Change-Id: Ia179d7c7ed69ea5f785b5dcd16394c7663a145cc
EPEL 7 was released September 30. The beta release rpm was removed
from the repo and was replaced with the final release rpm.
Change-Id: I103a2f7abd7563869b9e39ccc1fbb3cfbd9ff6ae
This patch adds a new EPEL element for use with EL-based distros
in accordance with the official docs[1]. This patch also
modifies the rhel7 element to not use the hard-coded repo file.
[1] https://fedoraproject.org/wiki/EPEL
Change-Id: Ib2fa24b2d519837271a0e213a2dc5a012cc31f3c
