Ben Nemec e5a2e07301 Check for epel before installing it
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
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