Drop SecurityGroupServerRpcApiMixin
Drop SecurityGroupServerRpcApiMixin

The code base has now been migrated away from using this class, so it
can be removed.  This was a prerequisite to being able to put this rpc
api into a messaging namespace.

Part of blueprint rpc-docs-and-namespaces.

Change-Id: I967339c4579d42c5ca9cea7f1ef3ba2233a6ff9d

barnsnake351/neutron,paninetworks/neutron,yanheven/neutron,rdo-management/neutron,yuewko/neutron,huntxu/neutron,magic0704/neutron,asgard-lab/neutron,yanheven/neutron,wenhuizhang/neutron,chitr/neutron,skyddv/neutron,igor-toga/local-snat,klmitch/neutron,dhanunjaya/neutron,bgxavier/neutron,cloudbase/neutron-virtualbox,JianyuWang/neutron,mahak/neutron,shahbazn/neutron,bigswitch/neutron,swdream/neutron,waltBB/neutron_read,neoareslinux/neutron,dhanunjaya/neutron,openstack/neutron,JianyuWang/neutron,vivekanand1101/neutron,paninetworks/neutron,miyakz1192/neutron,swdream/neutron,silenci/neutron,mandeepdhami/neutron,neoareslinux/neutron,SmartInfrastructures/neutron,huntxu/neutron,takeshineshiro/neutron,cisco-openstack/neutron,dims/neutron,waltBB/neutron_read,NeCTAR-RC/neutron,asgard-lab/neutron,jerryz1982/neutron,jacknjzhou/neutron,apporc/neutron,mandeepdhami/neutron,openstack/neutron,JioCloud/neutron,noironetworks/neutron,JioCloud/neutron,cisco-openstack/neutron,Stavitsky/neutron,infobloxopen/neutron,dims/neutron,mattt416/neutron,aristanetworks/neutron,wolverineav/neutron,eonpatapon/neutron,glove747/liberty-neutron,shahbazn/neutron,klmitch/neutron,barnsnake351/neutron,openstack/neutron,suneeth51/neutron,bgxavier/neutron,magic0704/neutron,alexandrucoman/vbox-neutron-agent,SamYaple/neutron,antonioUnina/neutron,watonyweng/neutron,cloudbase/neutron,watonyweng/neutron,chitr/neutron,apporc/neutron,adelina-t/neutron,antonioUnina/neutron,jumpojoy/neutron,mmnelemane/neutron,sebrandon1/neutron,eayunstack/neutron,takeshineshiro/neutron,sasukeh/neutron,silenci/neutron,adelina-t/neutron,aristanetworks/neutron,Stavitsky/neutron,sasukeh/neutron,eonpatapon/neutron,pnavarro/neutron,jerryz1982/neutron,wolverineav/neutron,bigswitch/neutron,javaos74/neutron,eayunstack/neutron,suneeth51/neutron,noironetworks/neutron,NeCTAR-RC/neutron,wenhuizhang/neutron,alexandrucoman/vbox-neutron-agent,SamYaple/neutron,mahak/neutron,mahak/neutron,mattt416/neutron,miyakz1192/neutron,MaximNevrov/neutron,rdo-management/neutron,blueboxgroup/neutron,skyddv/neutron,sebrandon1/neutron,MaximNevrov/neutron,SmartInfrastructures/neutron,mmnelemane/neutron,yuewko/neutron,blueboxgroup/neutron,jumpojoy/neutron,cloudbase/neutron,pnavarro/neutron,infobloxopen/neutron,igor-toga/local-snat,glove747/liberty-neutron,vivekanand1101/neutron,blueboxgroup/neutron,jacknjzhou/neutron,javaos74/neutron,cloudbase/neutron-virtualbox