Revert make test conditional change
    
    Previous commit incorrectly changed condition for running 'make test'
    from 0%{?rhel} != 6 to 0%{?rhel} > 6 with intention to make it more
    obvious that tests are enabled on RHEL/EPEL 7 and later, but it
    unintentionally disabled tests on Fedora (and possibly other distros).