Evergreen runs of test/csuite/import are failing with:
2019/06/07 17:11:29.808] Running command 'shell.exec' (step 3 of 3) [2019/06/07 17:11:29.809] PATH=/opt/mongodbtoolchain/v3/bin:$PATH LD_LIBRARY_PATH=$(pwd)/.libs top_srcdir=$(pwd)/.. top_builddir=$(pwd) $(pwd)/../test/csuite/import/smoke.sh 2>&1 [2019/06/07 17:11:30.385] [1559941890:385308][20319:0x7fe1b2b03740], t, connection: __encryptor_confchk, 387: unknown encryptor 'rotn': Invalid argument