Revert to prior method of executing a libvirt hard_reboot.
Revert to prior method of executing a libvirt hard_reboot.

Fixes bug 1036826.

Using reset for hard_reboot is not reliable, even where it is supported
by libvirt. Hard reboots are one of the only ways to recover a VM in a
broken state. The reset command assumes the domain is running in some
capacity and will fail if it is not.

Hard reset is the current sledgehammer for fixing issues and it really
needs to stay that way.

Change-Id: I84705b72d79cf71adad066b18267fdfb199bc9cb

yrobla/nova,jianghuaw/nova,dawnpower/nova,felixma/nova,savi-dev/nova,TieWei/nova,luogangyi/bcec-nova,projectcalico/calico-nova,ted-gould/nova,tanglei528/nova,akash1808/nova,paulmathews/nova,Juniper/nova,mgagne/nova,eayunstack/nova,leilihh/nova,sridevikoushik31/nova,shahar-stratoscale/nova,rahulunair/nova,akash1808/nova_test_latest,mandeepdhami/nova,JioCloud/nova_test_latest,maheshp/novatest,spring-week-topos/nova-week,gspilio/nova,takeshineshiro/nova,zhimin711/nova,maoy/zknova,BeyondTheClouds/nova,noironetworks/nova,OpenAcademy-OpenStack/nova-scheduler,usc-isi/nova,houshengbo/nova_vmware_compute_driver,CloudServer/nova,BeyondTheClouds/nova,dawnpower/nova,edulramirez/nova,maheshp/novatest,devoid/nova,yrobla/nova,BeyondTheClouds/nova,cernops/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,cyx1231st/nova,NewpTone/stacklab-nova,openstack/nova,zzicewind/nova,vmturbo/nova,OpenAcademy-OpenStack/nova-scheduler,belmiromoreira/nova,dstroppa/openstack-smartos-nova-grizzly,klmitch/nova,Triv90/Nova,openstack/nova,mmnelemane/nova,cernops/nova,projectcalico/calico-nova,gooddata/openstack-nova,dstroppa/openstack-smartos-nova-grizzly,paulmathews/nova,alexandrucoman/vbox-nova-driver,alvarolopez/nova,yatinkumbhare/openstack-nova,TwinkleChawla/nova,berrange/nova,LoHChina/nova,qwefi/nova,leilihh/novaha,cloudbau/nova,houshengbo/nova_vmware_compute_driver,Juniper/nova,bgxavier/nova,saleemjaveds/https-github.com-openstack-nova,vladikr/nova_drafts,sebrandon1/nova,fajoy/nova,edulramirez/nova,angdraug/nova,CloudServer/nova,savi-dev/nova,Tehsmash/nova,shahar-stratoscale/nova,NewpTone/stacklab-nova,badock/nova,JioCloud/nova,hanlind/nova,sacharya/nova,cernops/nova,tudorvio/nova,alexandrucoman/vbox-nova-driver,rajalokan/nova,thomasem/nova,rickerc/nova_audit,joker946/nova,Juniper/nova,sridevikoushik31/nova,CCI-MOC/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,zaina/nova,hanlind/nova,saleemjaveds/https-github.com-openstack-nova,JioCloud/nova_test_latest,Triv90/Nova,watonyweng/nova,SUSE-Cloud/nova,ted-gould/nova,blueboxgroup/nova,viggates/nova,bigswitch/nova,Yuriy-Leonov/nova,scripnichenko/nova,Francis-Liu/animated-broccoli,yosshy/nova,citrix-openstack-build/nova,rrader/nova-docker-plugin,Tehsmash/nova,gspilio/nova,tangfeixiong/nova,iuliat/nova,eharney/nova,dstroppa/openstack-smartos-nova-grizzly,bclau/nova,alvarolopez/nova,ntt-sic/nova,vmturbo/nova,Stavitsky/nova,DirectXMan12/nova-hacking,ntt-sic/nova,double12gzh/nova,Juniper/nova,viggates/nova,jeffrey4l/nova,Metaswitch/calico-nova,fnordahl/nova,eharney/nova,TwinkleChawla/nova,phenoxim/nova,double12gzh/nova,NeCTAR-RC/nova,yosshy/nova,sacharya/nova,petrutlucian94/nova,Metaswitch/calico-nova,whitepages/nova,mgagne/nova,maelnor/nova,joker946/nova,angdraug/nova,tealover/nova,silenceli/nova,rajalokan/nova,JianyuWang/nova,mahak/nova,dims/nova,jeffrey4l/nova,aristanetworks/arista-ovs-nova,imsplitbit/nova,plumgrid/plumgrid-nova,whitepages/nova,imsplitbit/nova,sridevikoushik31/openstack,mikalstill/nova,NeCTAR-RC/nova,nikesh-mahalka/nova,CiscoSystems/nova,leilihh/novaha,orbitfp7/nova,devendermishrajio/nova_test_latest,LoHChina/nova,eonpatapon/nova,belmiromoreira/nova,dims/nova,devendermishrajio/nova_test_latest,gooddata/openstack-nova,thomasem/nova,usc-isi/nova,felixma/nova,klmitch/nova,orbitfp7/nova,virtualopensystems/nova,CiscoSystems/nova,phenoxim/nova,ewindisch/nova,sridevikoushik31/nova,MountainWei/nova,citrix-openstack-build/nova,fajoy/nova,cloudbase/nova,fajoy/nova,bigswitch/nova,cyx1231st/nova,tianweizhang/nova,rajalokan/nova,vmturbo/nova,usc-isi/nova,sridevikoushik31/nova,virtualopensystems/nova,raildo/nova,Yusuke1987/openstack_template,gspilio/nova,qwefi/nova,CEG-FYP-OpenStack/scheduler,devendermishrajio/nova,ewindisch/nova,devendermishrajio/nova,apporc/nova,vmturbo/nova,Yusuke1987/openstack_template,tudorvio/nova,aristanetworks/arista-ovs-nova,MountainWei/nova,berrange/nova,alaski/nova,zhimin711/nova,bclau/nova,rajalokan/nova,cloudbau/nova,Francis-Liu/animated-broccoli,sebrandon1/nova,affo/nova,badock/nova,redhat-openstack/nova,klmitch/nova,yrobla/nova,petrutlucian94/nova_dev,openstack/nova,tealover/nova,TieWei/nova,sridevikoushik31/openstack,devoid/nova,sebrandon1/nova,Stavitsky/nova,tangfeixiong/nova,cloudbase/nova,shail2810/nova,akash1808/nova,mmnelemane/nova,zzicewind/nova,CEG-FYP-OpenStack/scheduler,adelina-t/nova,akash1808/nova_test_latest,spring-week-topos/nova-week,mahak/nova,tanglei528/nova,plumgrid/plumgrid-nova,barnsnake351/nova,isyippee/nova,zaina/nova,luogangyi/bcec-nova,noironetworks/nova,savi-dev/nova,ruslanloman/nova,NewpTone/stacklab-nova,eonpatapon/nova,alaski/nova,silenceli/nova,blueboxgroup/nova,aristanetworks/arista-ovs-nova,jianghuaw/nova,adelina-t/nova,j-carpentier/nova,varunarya10/nova_test_latest,klmitch/nova,bgxavier/nova,Triv90/Nova,redhat-openstack/nova,affo/nova,gooddata/openstack-nova,rahulunair/nova,scripnichenko/nova,barnsnake351/nova,shootstar/novatest,nikesh-mahalka/nova,paulmathews/nova,Yuriy-Leonov/nova,maelnor/nova,CCI-MOC/nova,mikalstill/nova,houshengbo/nova_vmware_compute_driver,kimjaejoong/nova,rahulunair/nova,iuliat/nova,JianyuWang/nova,cloudbase/nova-virtualbox,mikalstill/nova,DirectXMan12/nova-hacking,yatinkumbhare/openstack-nova,maoy/zknova,cloudbase/nova,isyippee/nova,shail2810/nova,sridevikoushik31/openstack,maheshp/novatest,hanlind/nova,kimjaejoong/nova,SUSE-Cloud/nova,gooddata/openstack-nova,jianghuaw/nova,apporc/nova,rrader/nova-docker-plugin,rickerc/nova_audit,cloudbase/nova-virtualbox,mandeepdhami/nova,watonyweng/nova,mahak/nova,varunarya10/nova_test_latest,leilihh/nova,petrutlucian94/nova,fnordahl/nova,maoy/zknova,eayunstack/nova,petrutlucian94/nova_dev,raildo/nova,shootstar/novatest,DirectXMan12/nova-hacking,ruslanloman/nova,JioCloud/nova,j-carpentier/nova,takeshineshiro/nova,tianweizhang/nova,vladikr/nova_drafts,jianghuaw/nova