Add preparation step
Add preparation step

Put,delete operations work on objects in range [0, 1000).
Get operations work on objects in range [1000, 2000).
Object for get operations will be uploaded in each buckets in the
preparation step.

Database will be deleted after each test.

truststamp/S3,scality/S3,lucisilv/Silviu_S3-Antidote,truststamp/S3,tomateos/S3,lucisilv/Silviu_S3-Antidote,scality/S3,lucisilv/Silviu_S3-Antidote,truststamp/S3,lucisilv/Silviu_S3-Antidote,scality/S3,tomateos/S3,scality/S3,truststamp/S3,tomateos/S3,scality/S3,tomateos/S3,lucisilv/Silviu_S3-Antidote,truststamp/S3,lucisilv/Silviu_S3-Antidote,scality/S3,truststamp/S3,lucisilv/Silviu_S3-Antidote,truststamp/S3,scality/S3,lucisilv/Silviu_S3-Antidote,truststamp/S3,tomateos/S3,scality/S3,tomateos/S3,tomateos/S3,tomateos/S3