Don't quote {posargs} in tox.ini
Don't quote {posargs} in tox.ini

Quotes around {posargs} cause the entire string to be combined into one
arg that gets passed to stestr. This prevents passing multiple args
(e.g. '--concurrency=16 some-regex')

Change-Id: I97019542009784ff81b565b6936be6774f2557f1

stackforge/osprofiler,stackforge/osprofiler,stackforge/osprofiler,openstack/osprofiler,openstack/osprofiler,openstack/osprofiler