Wait for VM to stop before deleting security group.
Wait for VM to stop before deleting security group.

Related to bug 938853.

The patch for this bug prevents deleting security groups through the
OpenStack API if they are still in use.  This patch for devstack updates
the floating_ips exercise script to wait until the VM has stopped before
deleting the security group.

Change-Id: If42f85934c2b92d4d001c419cabb09e2e3dc1aae

ykaneko/devstack,prithivm/branch01,group-policy/devstack,andrewrothstein/devstack,bswartz/devstack,nati/devstack_public,nuxeh/devstack,JioCloud/devstack,atulpatil301/devstack,CiscoSystems/devstack,inkerra/devstack,ewindisch/raspi-devstack,liuquansheng47/devstack,mssumanth/devstack,bq-xiao/devstack,tianweizhang/devstack,vishnugonela/devstack,citrix-openstack-build/devstack,vishnugonela/devstack,prithivm/branch01,pacinete/devstack,citrix-openstack-build/devstack,eshnil2000/devstack,atulpatil301/devstack,samgoon/devstack,avvocatodemarchis/devstack,dtroyer/devstack,bljgaurav/openstack-test,pombredanne/devstack,r-mibu/devstack,sc68cal/devstack,tianweizhang/devstack,thomasem/devstack,kplus/devstack-moonshot,eharney/devstack,mc2014/devstack,promptworks/devstack,TwinkleChawla/devstack,mc2014/devstack,bigswitch/devstack,Yuriy-Leonov/devstack,bigswitch/devstack,herrsechs/devstack,pczerkas/devstack,thomasem/devstack,parul24/devstack,cloudbuilders/devstack,r-mibu/devstack,dtroyer/devstack,bljgaurav/openstack-test,williamthegrey/devstack,deepakselvaraj/devstack,Mahito/devstack,NaokiMiyata/devstack,herrsechs/devstack,j4/devstack,noironetworks/devstack,CloudServer/devstack,yamt/devstack,mmasaki/devstack,openstack-dev/devstack,LoHChina/devstack,upadhyay-prashant/devstack,group-policy/devstack,pacinete/devstack,sc68cal/devstack,vsham20/devstack,innodee/openstackk,TwinkleChawla/devstack,olivierlemasle/devstack,costingalan/devstack,pczerkas/devstack,wenhuizhang/devstack,rushiagr/devstack,mmasaki/devstack,olivierlemasle/devstack,savi-dev/devstack,armando-migliaccio/devstack,costingalan/devstack,eharney/devstack,wenhuizhang/devstack,ozamiatin/devstack,shootstar/devstacktest,liuquansheng47/devstack,ykaneko/devstack,promptworks/devstack,samgoon/devstack,neerja28/Devstack_GlusterFS,varunarya10/devstack,noironetworks/devstack,bq-xiao/devstack,savi-dev/devstack,sequenceiq/devstack,LoHChina/devstack,virtualopensystems/devstack,sequenceiq/devstack,affo/devstack,richliu/devstack,bswartz/devstack,sstrato/devstack,nuxeh/devstack,Juniper/devstack,upadhyay-prashant/devstack,flavio-fernandes/devstack,BSJAIN92/OpenStack,srics/devstack,Mahito/devstack,rushiagr/devstack,nttmcl/devstack_public,jamielennox/devstack,BSJAIN92/OpenStack,parul24/devstack,Millnert/contrail-devstack,nawawi/openstack,nawawi/openstack,kplus/devstack-moonshot,vsham20/devstack,dirkmueller/devstack,dirkmueller/devstack,ewindisch/raspi-devstack,nttmcl/devstack_public,nati/devstack_public,CloudServer/devstack,mssumanth/devstack,varunarya10/devstack,affo/devstack,HPCHub/devstack,neerja28/Devstack_GlusterFS,pombredanne/devstack,flavio-fernandes/devstack,ozamiatin/devstack,cloudbuilders/devstack,avvocatodemarchis/devstack,j4/devstack,richliu/devstack,HPCHub/devstack,openstack-dev/devstack,andrewrothstein/devstack,NaokiMiyata/devstack