Revert c2f197e0 - Update the test experiments to use the 'simple/1' database

test/experiments/username/username/double/1/double.json

.../experiments/username/username/double/1/double_error.json

...ents/username/username/double/1/double_error_split_2.json

...ents/username/username/double/1/double_sleep_split_2.json

...xperiments/username/username/double/1/double_split_2.json

.../username/username/double_triangle/1/double_triangle.json

test/experiments/username/username/single/1/single.json

test/experiments/username/username/single/1/single_add.json

test/experiments/username/username/single/1/single_add2.json

.../experiments/username/username/single/1/single_error.json

...ents/username/username/single/1/single_error_split_2.json

.../experiments/username/username/single/1/single_large.json

.../experiments/username/username/single/1/single_sleep.json

...xperiments/username/username/single/1/single_sleep_4.json

...xperiments/username/username/single/1/single_sleep_5.json

...periments/username/username/single/1/single_split_10.json

...xperiments/username/username/single/1/single_split_2.json

test/experiments/username/username/triangle/1/triangle.json

...eriments/username/username/triangle/1/triangle_sleep.json

...iments/username/username/triangle/1/triangle_sleep_4.json