We currently disable testing the combination of timestamps and LSM in test/format, which was waiting on work scheduled in
WT-4067 (which was done). We should do testing with LSM and timestamps, to uncover any further issues, and re-enable it as a randomly chosen configuration pair once all issues are resolved.
Checking the format/config.c file for the string "
WT-4067" will show where changes are required to re-enable the pair of options. We should probably also check the lines in the config_cache() function in that same file, to make sure we remove all related restrictions.