The test cannot_create_system_dot_indexes.js should not be run on mmapv1 because system.indexes is a real collection on mmapv1.

This command in indexes_on_indexes.js fails with a different code on mmapv1 from on wiredTiger because on wiredTiger, it is illegal to create the collection system.indexes, and on mmapv1, the system.indexes collection already exists, but it is illegal to create indexes on it.