Matthew Thode e09823570f Add remote procedure call tunables to nova and neutron
This allows us to override the default settings, which is useful for
large deployments or deploying a large number of instances.  It also
uses an unused variable in neutron for setting the rpc_backend.

Change-Id: I83d11eb79b30dda51c6f738433ca960a0f63246e
Closes-bug: 1471926
2015-07-23 15:06:08 -05:00
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