Revert "Fix broken py3 tests"

This reverts commit 0c47ce00b1d9e4801a2043e0e14ba62e896da2a9.
Revert "Experimental import fix"

This reverts commit 7a10f6b39a2c1f191c977571e69ceafe8022c006.
Revert "Add test runner"

This reverts commit b7f94e3609b027f108b75f89bf63f07e54262d7d.