Completes unittest coverage of quantum.api.v2.attributes.py
Completes unittest coverage of quantum.api.v2.attributes.py

Tests were added to cover all cases of each function

Change-Id: Ic856bc6efb84360a8f5eaffde09dd68055bbe9c9

mandeepdhami/neutron,javaos74/neutron,JioCloud/neutron,kaiweifan/neutron,alexandrucoman/vbox-neutron-agent,citrix-openstack-build/neutron,Juniper/neutron,rossella/neutron,tpaszkowski/quantum,glove747/liberty-neutron,SmartInfrastructures/neutron,vivekanand1101/neutron,SamYaple/neutron,mahak/neutron,yamahata/neutron,gkotton/neutron,leeseuljeong/leeseulstack_neutron,vijayendrabvs/hap,klmitch/neutron,sajuptpm/neutron-ipam,suneeth51/neutron,tpaszkowski/quantum,tpaszkowski/quantum,blueboxgroup/neutron,vivekanand1101/neutron,Juniper/neutron,aristanetworks/neutron,armando-migliaccio/neutron,asgard-lab/neutron,jerryz1982/neutron,bigswitch/neutron,ykaneko/neutron,shahbazn/neutron,shahbazn/neutron,Brocade-OpenSource/OpenStack-DNRM-Neutron,Juniper/contrail-dev-neutron,MaximNevrov/neutron,apporc/neutron,vijayendrabvs/ssl-neutron,cernops/neutron,mattt416/neutron,dims/neutron,armando-migliaccio/neutron,takeshineshiro/neutron,MaximNevrov/neutron,aristanetworks/arista-ovs-quantum,wolverineav/neutron,SmartInfrastructures/neutron,ntt-sic/neutron,vijayendrabvs/ssl-neutron,mandeepdhami/neutron,CiscoSystems/neutron,openstack/neutron,mahak/neutron,rossella/neutron,Comcast/neutron,ntt-sic/neutron,rossella/neutron,yanheven/neutron,projectcalico/calico-neutron,cisco-openstack/neutron,Stavitsky/neutron,citrix-openstack-build/neutron,cloudbase/neutron,virtualopensystems/neutron,yamahata/tacker,Metaswitch/calico-neutron,Stavitsky/neutron,vbannai/neutron,kaiweifan/vse-lbaas-plugin-poc,silenci/neutron,waltBB/neutron_read,barnsnake351/neutron,beagles/neutron_hacking,chitr/neutron,aristanetworks/arista-ovs-quantum,jumpojoy/neutron,jerryz1982/neutron,swdream/neutron,JianyuWang/neutron,pnavarro/neutron,armando-migliaccio/neutron,rickerc/neutron_audit,kaiweifan/neutron,CiscoSystems/vespa,yamt/neutron,ykaneko/quantum,asgard-lab/neutron,sebrandon1/neutron,liqin75/vse-vpnaas-plugin,yamt/neutron,jacknjzhou/neutron,vijayendrabvs/hap,vbannai/neutron,oeeagle/quantum,aristanetworks/neutron,redhat-openstack/neutron,zhhf/charging,skyddv/neutron,huntxu/neutron,gkotton/neutron,dims/neutron,infobloxopen/neutron,igor-toga/local-snat,yuewko/neutron,CiscoSystems/vespa,beagles/neutron_hacking,adelina-t/neutron,sajuptpm/neutron-ipam,bigswitch/neutron,vveerava/Openstack,rossella/neutron,kaiweifan/neutron,Juniper/neutron,mmnelemane/neutron,CiscoSystems/quantum,paninetworks/neutron,cloudbase/neutron,antonioUnina/neutron,citrix-openstack-build/neutron,cisco-openstack/neutron,tpaszkowski/quantum,leeseuljeong/leeseulstack_neutron,igor-toga/local-snat,yamt/neutron,suneeth51/neutron,klmitch/neutron,infobloxopen/neutron,CiscoSystems/neutron,adelina-t/neutron,cernops/neutron,Brocade-OpenSource/OpenStack-DNRM-Neutron,bgxavier/neutron,CiscoSystems/vespa,ykaneko/quantum,cloudbase/neutron-virtualbox,chitr/neutron,leeseulstack/openstack,jumpojoy/neutron,cloudbase/neutron-virtualbox,sajuptpm/neutron-ipam,virtualopensystems/neutron,miyakz1192/neutron,CiscoSystems/quantum,aristanetworks/arista-ovs-quantum,watonyweng/neutron,virtualopensystems/neutron,wenhuizhang/neutron,armando-migliaccio/neutron,zhhf/charging,ykaneko/neutron,mattt416/neutron,netscaler/neutron,yamahata/neutron,leeseulstack/openstack,kaiweifan/vse-lbaas-plugin-poc,miyakz1192/neutron,vbannai/neutron,wolverineav/neutron,watonyweng/neutron,sasukeh/neutron,NeCTAR-RC/neutron,liqin75/vse-vpnaas-plugin,dhanunjaya/neutron,barnsnake351/neutron,Comcast/neutron,paninetworks/neutron,waltBB/neutron_read,neoareslinux/neutron,Comcast/neutron,rdo-management/neutron,yamahata/neutron,JianyuWang/neutron,skyddv/neutron,vveerava/Openstack,apporc/neutron,ykaneko/quantum,vijayendrabvs/ssl-neutron,kaiweifan/vse-lbaas-plugin-poc,liqin75/vse-vpnaas-plugin,wenhuizhang/neutron,mmnelemane/neutron,openstack/neutron,NeCTAR-RC/neutron,eayunstack/neutron,liqin75/vse-vpnaas-plugin,swdream/neutron,silenci/neutron,ntt-sic/neutron,netscaler/neutron,magic0704/neutron,huntxu/neutron,noironetworks/neutron,antonioUnina/neutron,dhanunjaya/neutron,Juniper/contrail-dev-neutron,rdo-management/neutron,SamYaple/neutron,beagles/neutron_hacking,kaiweifan/vse-lbaas-plugin-poc,rickerc/neutron_audit,ykaneko/neutron,leeseuljeong/leeseulstack_neutron,pnavarro/neutron,yuewko/neutron,Brocade-OpenSource/OpenStack-DNRM-Neutron,yamahata/tacker,vveerava/Openstack,gkotton/neutron,eonpatapon/neutron,ykaneko/quantum,eayunstack/neutron,magic0704/neutron,takeshineshiro/neutron,Juniper/contrail-dev-neutron,openstack/neutron,CiscoSystems/quantum,JioCloud/neutron,glove747/liberty-neutron,sasukeh/neutron,mahak/neutron,gopal1cloud/neutron,redhat-openstack/neutron,rickerc/neutron_audit,netscaler/neutron,noironetworks/neutron,aristanetworks/arista-ovs-quantum,vijayendrabvs/hap,blueboxgroup/neutron,javaos74/neutron,leeseulstack/openstack,yanheven/neutron,zhhf/charging,blueboxgroup/neutron,gopal1cloud/neutron,yamt/neutron,yamahata/tacker,oeeagle/quantum,CiscoSystems/neutron,jacknjzhou/neutron,sebrandon1/neutron,bgxavier/neutron,alexandrucoman/vbox-neutron-agent,neoareslinux/neutron,eonpatapon/neutron,projectcalico/calico-neutron,Metaswitch/calico-neutron