Revert "do not use ZenTest 4.8.4"

This reverts commit 3ce18342ebcd95931481e2f3e3ae06e40c9c9188.
Revert "workaround BZ 901540"

This reverts commit 190d7f1f8d4e45de2e9218c59e560c63448fa51e.
Revert "do not fail if you use bundler"

This reverts commit fca7451d7eee7b8d646ba5b2d49367fcae7a0349.
Revert "correctly compare version"

This reverts commit acebd447f79f16aacc1579694a4452338f5184f1.
Revert "Fix F16,EL6 after fixing F18"

This reverts commit d9fddb212e2aa2256a903d8ff9e8d115ba1aec00.
Revert "fix building on F18"

This reverts commit c1076682876ef62c29b6d71a2cf5ffe68efc609a.
avoid problematic ZenTest-4.8.4