This reverts commit b0643f8959, reversing
changes made to e8b0f8faa9.
The change forgot to update
sstables_manager::get_highest_supported_format(), which results in
/system/highest_supported_sstable_version still returning me, confusing
and breaking tests.
Fixes: scylladb/scylla-dtest#6435Closesscylladb/scylladb#27379
Trie-based sstable indexes are supposed to be (hopefully)
a better default than the old BIG indexes.
Make them the new default.
If we change our mind, this change can be reverted later.
Use universalasync library to make test.py async code compatible
with synchronous code of dtest/ccm
Also, copied unmodified error_example_test.py from dtest as an example.
Run the test in `dev` mode only.