Changes

• Initial HEAD time is not counted toward convergence time. If first HEAD returns correct data then convergence time is 0.
• Removed unnecessary no-cache headers.
• X-Tigris-Regions is removed in main9.py so it's run in one region. In order to properly test X-Tigris-Consistent: true functonality. This test need to be divided into two parts, put and get and run from VMs in different regions.

Run individual tests

BUCKET=<bucket name> AWS_PROFILE=<aws config profile> python3 main.py