Adding symlink for Red Hat support

[mmyer2]

Install fails on RHEL without this in place.

[dkliban]

@mmyer2 Thanks for the PR! Either add [noissue] to the commit message or create an issue in http://pulp.plan.io/issues/new/ and reference it in your commit.

https://travis-ci.com/pulp/pulp_rpm_prerequisites/jobs/286999739#L283

https://docs.pulpproject.org/contributing/git.html#commit-message

[mikedep333]

Hi @mmyer2 Unfortunatley, each commit needs to have [noissue]. And this change is best as 1 commit.

If you are unfamiliar, these git rebase instructions should work from your master branch: (assuming origin is pulp/pulp_rpm_prerequisities):
git fetch origin
git rebase --interactive origin/master
git push --force

[mikedep333]

@mmyer2 I amended the commit message and merged #38.

Thank you very much!