ml2/type_gre: Adds missing clear_db to test_type_gre.py
ml2/type_gre: Adds missing clear_db to test_type_gre.py

GreTypeTest.setUp() in test_type_gre.py should have
self.addCleanup(db.clear_db). This patch adds it.

Change-Id: I1f2ac5d2cae47812591fc5b50099053a4ad9ba85
Closes-Bug: #1261593

mandeepdhami/neutron,aristanetworks/neutron,SamYaple/neutron,blueboxgroup/neutron,mahak/neutron,sajuptpm/neutron-ipam,vijayendrabvs/hap,SmartInfrastructures/neutron,cisco-openstack/neutron,swdream/neutron,cernops/neutron,bgxavier/neutron,zhhf/charging,NeCTAR-RC/neutron,leeseulstack/openstack,Comcast/neutron,cloudbase/neutron-virtualbox,mattt416/neutron,leeseuljeong/leeseulstack_neutron,yamahata/tacker,redhat-openstack/neutron,leeseulstack/openstack,rdo-management/neutron,sajuptpm/neutron-ipam,magic0704/neutron,watonyweng/neutron,eayunstack/neutron,dhanunjaya/neutron,leeseulstack/openstack,noironetworks/neutron,yamahata/tacker,yamahata/neutron,openstack/neutron,asgard-lab/neutron,yanheven/neutron,noironetworks/neutron,vijayendrabvs/ssl-neutron,oeeagle/quantum,SamYaple/neutron,Juniper/contrail-dev-neutron,chitr/neutron,JianyuWang/neutron,mandeepdhami/neutron,eonpatapon/neutron,beagles/neutron_hacking,huntxu/neutron,CiscoSystems/neutron,virtualopensystems/neutron,silenci/neutron,klmitch/neutron,vivekanand1101/neutron,gkotton/neutron,watonyweng/neutron,openstack/neutron,MaximNevrov/neutron,bigswitch/neutron,vivekanand1101/neutron,leeseuljeong/leeseulstack_neutron,jumpojoy/neutron,NeCTAR-RC/neutron,javaos74/neutron,adelina-t/neutron,virtualopensystems/neutron,skyddv/neutron,jumpojoy/neutron,eayunstack/neutron,zhhf/charging,barnsnake351/neutron,pnavarro/neutron,zhhf/charging,oeeagle/quantum,asgard-lab/neutron,antonioUnina/neutron,infobloxopen/neutron,apporc/neutron,projectcalico/calico-neutron,sebrandon1/neutron,sajuptpm/neutron-ipam,cloudbase/neutron,wenhuizhang/neutron,yamahata/neutron,Stavitsky/neutron,vbannai/neutron,Metaswitch/calico-neutron,waltBB/neutron_read,barnsnake351/neutron,alexandrucoman/vbox-neutron-agent,magic0704/neutron,Juniper/contrail-dev-neutron,JioCloud/neutron,apporc/neutron,SmartInfrastructures/neutron,CiscoSystems/neutron,swdream/neutron,leeseuljeong/leeseulstack_neutron,blueboxgroup/neutron,takeshineshiro/neutron,mahak/neutron,redhat-openstack/neutron,huntxu/neutron,eonpatapon/neutron,Juniper/neutron,gkotton/neutron,mahak/neutron,chitr/neutron,miyakz1192/neutron,jerryz1982/neutron,klmitch/neutron,JioCloud/neutron,vveerava/Openstack,gopal1cloud/neutron,javaos74/neutron,wolverineav/neutron,vijayendrabvs/ssl-neutron,Juniper/neutron,skyddv/neutron,neoareslinux/neutron,beagles/neutron_hacking,blueboxgroup/neutron,wolverineav/neutron,jerryz1982/neutron,shahbazn/neutron,pnavarro/neutron,bigswitch/neutron,cernops/neutron,gkotton/neutron,vbannai/neutron,CiscoSystems/neutron,suneeth51/neutron,vijayendrabvs/ssl-neutron,silenci/neutron,waltBB/neutron_read,yamahata/tacker,Juniper/contrail-dev-neutron,cloudbase/neutron,glove747/liberty-neutron,miyakz1192/neutron,dhanunjaya/neutron,wenhuizhang/neutron,igor-toga/local-snat,vijayendrabvs/hap,projectcalico/calico-neutron,sasukeh/neutron,cisco-openstack/neutron,mattt416/neutron,yuewko/neutron,vveerava/Openstack,vveerava/Openstack,paninetworks/neutron,mmnelemane/neutron,yuewko/neutron,openstack/neutron,paninetworks/neutron,shahbazn/neutron,igor-toga/local-snat,adelina-t/neutron,takeshineshiro/neutron,jacknjzhou/neutron,dims/neutron,infobloxopen/neutron,vbannai/neutron,yanheven/neutron,Metaswitch/calico-neutron,rdo-management/neutron,Comcast/neutron,alexandrucoman/vbox-neutron-agent,dims/neutron,sasukeh/neutron,suneeth51/neutron,jacknjzhou/neutron,yamahata/neutron,Comcast/neutron,JianyuWang/neutron,glove747/liberty-neutron,vijayendrabvs/hap,Stavitsky/neutron,virtualopensystems/neutron,Juniper/neutron,antonioUnina/neutron,sebrandon1/neutron,mmnelemane/neutron,cloudbase/neutron-virtualbox,MaximNevrov/neutron,neoareslinux/neutron,beagles/neutron_hacking,aristanetworks/neutron,gopal1cloud/neutron,bgxavier/neutron