Due to Python's GIL [1], we can't use multiple threads for running
OpenStack services without a performance penalty, since the execution
ends up serialized, which defeats the purpose.
Instead, we should use several processes, since this approach doesn't
have this limitation.
[1] https://wiki.python.org/moin/GlobalInterpreterLock
This patch updates processes and threads accordingly for:
aodh
panko
nova
Related issue was fixed in different deployment tools like puppet
https://bugs.launchpad.net/puppet-keystone/+bug/1602530
Change-Id: Ia8eb4a1f3ed826e206edb94c680f40bcec44e9d7
3d6557279f