Updated openstack/openstack
Project: openstack/neutron  ab8d6756ebbe23624b39cbdfedcf2c54e65f04fe

Drop old code from SecurityGroupAgentRpcApiMixin

The SecurityGroupAgentRpcApiMixin class temporarily had support for
both RpcProxy and new oslo.messaging style rpc client interfaces.  Now
that all users of this mixin have been converted to direct usage of
oslo.messaging APIs, the old compatibility code can be removed.

Part of blueprint drop-rpc-compat.

Change-Id: I18dc65e7f14a8ae42e3c2bc81d1d73f61c12c1fc