Add optinal attribute 'force_new_db' to tests.functional.utils.Rally and use it. Change-Id: Ia7f0faedb5b5f6323c5e0ed00948b03a36e4f341
Add optinal attribute 'force_new_db' to tests.functional.utils.Rally and use it. Change-Id: Ia7f0faedb5b5f6323c5e0ed00948b03a36e4f341