Revert "Add initial support for building in a RHEL 7 mock"

This reverts commit b471b9d2a37ca10d0d20c294e813b5a46e6cabd9.
Merge pull request #2353 from melissaanne/maint/stable/revert-el7-mock

Revert "Add initial support for building in a RHEL 7 mock"