"Edit network" form sends unchanged parameters to Neutron API

"Edit network" form sends unchanged parameters to Neutron API, including "Shared" flag, even if it is disabled via policy. Neutron has a bug [1], and tries to apply all parameters from PUT request, even if the value wasn't changed. It leads to 403 during network rename, if "rule:update_network:shared" policy is disabled for current user. However, openstackclient sends only changed values - network name in this case, and unaffected by the issue

1. https://bugs.launchpad.net/neutron/+bug/1779003