Update config sample file with latest config options
Update config sample file with latest config options

Some config options have changed their help text like 'sqlite_db',
so run 'tox -e genconfig' to generate latest config sample file.

Change-Id: Ifad41b2e1203308c02392ad63e3e90853dbbca68

yeming233/rally,openstack/rally,yeming233/rally,openstack/rally,openstack/rally,openstack/rally