Updated openstack/openstack
Project: openstack/taskflow  7b2e6e99f3e68f9772000eb1c8a4165d0f4fd234

Just use 4 spaces for classifier indents

Keep the setup.cfg file consistently using only
four spaces and not having mixed 4 and 8 spaces.

Change-Id: I2e77766e6491be91e6744d4acf84eac16e39c627