Fix Neutron VPNaaS Test
Fix Neutron VPNaaS Test

VPNService requires Router is connected to external gateway.
In this commit, we connected the test router to external network.

Change-Id: Ib87583219efd8efd959c9c7edb813c3a70e7d20c
Closes-Bug:1259282

manasi24/tempest,ebagdasa/tempest,tudorvio/tempest,alinbalutoiu/tempest,pandeyop/tempest,Mirantis/tempest,JioCloud/tempest,varunarya10/tempest,Juniper/tempest,queria/my-tempest,rakeshmi/tempest,LIS/lis-tempest,neerja28/Tempest,tonyli71/tempest,vedujoshi/tempest,nunogt/tempest,manasi24/tempest,pczerkas/tempest,flyingfish007/tempest,izadorozhna/tempest,akash1808/tempest,roopali8/tempest,yamt/tempest,Tesora/tesora-tempest,NexusIS/tempest,akash1808/tempest,roopali8/tempest,danielmellado/tempest,afaheem88/tempest_neutron,JioCloud/tempest,afaheem88/tempest_neutron,zsoltdudas/lis-tempest,ntymtsiv/tempest,vmahuli/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,Juraci/tempest,dkalashnik/tempest,masayukig/tempest,manasi24/jiocloud-tempest-qatempest,rzarzynski/tempest,sebrandon1/tempest,Juniper/tempest,rakeshmi/tempest,Vaidyanath/tempest,openstack/tempest,pandeyop/tempest,vedujoshi/os_tempest,Mirantis/tempest,hpcloud-mon/tempest,eggmaster/tempest,sebrandon1/tempest,armando-migliaccio/tempest,redhat-cip/tempest,CiscoSystems/tempest,eggmaster/tempest,neerja28/Tempest,redhat-cip/tempest,vedujoshi/tempest,cisco-openstack/tempest,rzarzynski/tempest,cisco-openstack/tempest,Lilywei123/tempest,zsoltdudas/lis-tempest,masayukig/tempest,alinbalutoiu/tempest,bigswitch/tempest,vedujoshi/os_tempest,jaspreetw/tempest,xbezdick/tempest,jaspreetw/tempest,Vaidyanath/tempest,nunogt/tempest,xbezdick/tempest,vmahuli/tempest,hayderimran7/tempest,queria/my-tempest,izadorozhna/tempest,tonyli71/tempest,BeenzSyed/tempest,NexusIS/tempest,bigswitch/tempest,pczerkas/tempest,armando-migliaccio/tempest,Tesora/tesora-tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,hayderimran7/tempest,danielmellado/tempest,CiscoSystems/tempest,openstack/tempest,flyingfish007/tempest,dkalashnik/tempest,LIS/lis-tempest,BeenzSyed/tempest,afaheem88/tempest,cloudbase/lis-tempest,ntymtsiv/tempest,cloudbase/lis-tempest,tudorvio/tempest,varunarya10/tempest,Lilywei123/tempest,hpcloud-mon/tempest,afaheem88/tempest,yamt/tempest,ebagdasa/tempest,manasi24/jiocloud-tempest-qatempest,Juraci/tempest,jamielennox/tempest,jamielennox/tempest