libvirt: remove pointless loop after live migration finishes
libvirt: remove pointless loop after live migration finishes

The libvirt 'migrateToURI' API(s) all block the caller until the
live migration operation has completed. As such, the timer call
used to check if live migration has completed is entirely pointless.
It appears this is code left over from the very first impl of live
migration in Nova, when Nova would simply shell out to the 'virsh'
command instead of using the libvirt APIs. Even back then though
it looks like it was redundant, since the command being spawned
would also block until live migration was finished.

Related-bug: #1414065
Change-Id: Ib3906ef8564a986f7c0e980774e4ed76b3f93a38

tealover/nova,TwinkleChawla/nova,jianghuaw/nova,dawnpower/nova,iuliat/nova,adelina-t/nova,ted-gould/nova,dawnpower/nova,alvarolopez/nova,Francis-Liu/animated-broccoli,NeCTAR-RC/nova,tangfeixiong/nova,mmnelemane/nova,Juniper/nova,joker946/nova,CEG-FYP-OpenStack/scheduler,apporc/nova,felixma/nova,thomasem/nova,mikalstill/nova,double12gzh/nova,alaski/nova,affo/nova,affo/nova,isyippee/nova,devendermishrajio/nova,felixma/nova,openstack/nova,CloudServer/nova,akash1808/nova,cyx1231st/nova,akash1808/nova_test_latest,JianyuWang/nova,mikalstill/nova,edulramirez/nova,takeshineshiro/nova,Stavitsky/nova,petrutlucian94/nova,belmiromoreira/nova,tudorvio/nova,Yusuke1987/openstack_template,orbitfp7/nova,devendermishrajio/nova,BeyondTheClouds/nova,j-carpentier/nova,Juniper/nova,mandeepdhami/nova,Juniper/nova,JioCloud/nova,orbitfp7/nova,ruslanloman/nova,yosshy/nova,devendermishrajio/nova_test_latest,varunarya10/nova_test_latest,gooddata/openstack-nova,watonyweng/nova,scripnichenko/nova,jianghuaw/nova,akash1808/nova,rajalokan/nova,blueboxgroup/nova,shail2810/nova,hanlind/nova,rajalokan/nova,openstack/nova,bigswitch/nova,raildo/nova,Tehsmash/nova,rajalokan/nova,dims/nova,isyippee/nova,klmitch/nova,vmturbo/nova,JioCloud/nova,cernops/nova,klmitch/nova,openstack/nova,mikalstill/nova,kimjaejoong/nova,joker946/nova,jianghuaw/nova,rahulunair/nova,Yusuke1987/openstack_template,j-carpentier/nova,alexandrucoman/vbox-nova-driver,whitepages/nova,MountainWei/nova,ruslanloman/nova,cloudbase/nova,noironetworks/nova,jianghuaw/nova,zzicewind/nova,LoHChina/nova,varunarya10/nova_test_latest,LoHChina/nova,devendermishrajio/nova_test_latest,ted-gould/nova,fnordahl/nova,zhimin711/nova,zzicewind/nova,TwinkleChawla/nova,kimjaejoong/nova,double12gzh/nova,mmnelemane/nova,klmitch/nova,nikesh-mahalka/nova,scripnichenko/nova,eonpatapon/nova,dims/nova,barnsnake351/nova,watonyweng/nova,alvarolopez/nova,apporc/nova,petrutlucian94/nova,CloudServer/nova,gooddata/openstack-nova,nikesh-mahalka/nova,NeCTAR-RC/nova,whitepages/nova,bigswitch/nova,Juniper/nova,iuliat/nova,edulramirez/nova,tealover/nova,cyx1231st/nova,gooddata/openstack-nova,tangfeixiong/nova,mahak/nova,sebrandon1/nova,bgxavier/nova,vmturbo/nova,CCI-MOC/nova,shail2810/nova,bgxavier/nova,vmturbo/nova,JioCloud/nova_test_latest,tudorvio/nova,Stavitsky/nova,sebrandon1/nova,vmturbo/nova,belmiromoreira/nova,raildo/nova,phenoxim/nova,blueboxgroup/nova,takeshineshiro/nova,zaina/nova,hanlind/nova,barnsnake351/nova,jeffrey4l/nova,rahulunair/nova,phenoxim/nova,BeyondTheClouds/nova,yatinkumbhare/openstack-nova,hanlind/nova,akash1808/nova_test_latest,adelina-t/nova,JioCloud/nova_test_latest,yosshy/nova,thomasem/nova,cernops/nova,cloudbase/nova-virtualbox,cloudbase/nova,eonpatapon/nova,Tehsmash/nova,CCI-MOC/nova,fnordahl/nova,zhimin711/nova,JianyuWang/nova,MountainWei/nova,mahak/nova,mandeepdhami/nova,mahak/nova,CEG-FYP-OpenStack/scheduler,BeyondTheClouds/nova,cloudbase/nova-virtualbox,sebrandon1/nova,klmitch/nova,yatinkumbhare/openstack-nova,cloudbase/nova,gooddata/openstack-nova,rajalokan/nova,alaski/nova,noironetworks/nova,jeffrey4l/nova,rahulunair/nova,alexandrucoman/vbox-nova-driver,Francis-Liu/animated-broccoli,cernops/nova,zaina/nova