rollback_wt_cache_full.js sometimes fail when run with the (majority read concern off) configuration. It would be helpful to save the data files for this test the next time it fails.

The change should be made in this configuration file:

https://github.com/mongodb/mongo/blob/630eabac0591f207b29b6be014257387a9a7a904/buildscripts/resmokeconfig/suites/no_passthrough.yml