Split logs by storage node proxy and don't fill up the
/var/log/messages.
Set proxy-server in debug.
Only one worker by proxy-server since we are usually in debugging mode.
Change-Id: If39f35b98ad821e8a62e36e4c22e723f83e01db8
This is not the admin group per-se but the group where users can
create/delete containers.
This is will be fixed properly when the swift-keystone2 middleware would
be commited in keystone (should be sometime soon).
