Due to the shortcoming of QManager implementation [1], in case of uWSGI
usage on metal hosts, the flow ends up with having the same
hostname/processname set, making services to fight over same file
under SHM.
In order to avoid this, we prepend the hostname with a service_name.
We can not change processname instead, since it will lead to the fight
between different processes of the same service.
[1] https://bugs.launchpad.net/oslo.messaging/+bug/2065922
Change-Id: Ie8c68cad4a89e5fcc43dad53d895d093cb3fe671
85bbd5f2c3