There is no technical reason to disable sorting and pagination, except
maybe performance concerns. But there are other ways to DoS-attack
neutron-server services, like... any other type of request. So the
concern is moot.
Keeping those options available for configuration reduces compatibility
between Neutron installations. It's better to do the right thing, and do
it right, implementing the feature for the benefit of API users.
DocImpact Update configuration documentation to reflect deprecation.
Change-Id: Iad26221a58589b10381f1a0d69a88c92fb5adeee
Related-Bug: #1566514
