s3blaster perf tests: put, get, delete actions
s3blaster perf tests: put, get, delete actions

Measure average and std deviation of time for put, get, delete actions.
Different use cases:
- only PUT
- only GET
- only DELETE
- PUT then GET
- GET then DELETE
- PUT then DELETE
- PUT then GET then DELETE

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