Update NovaKeystoneContext to use jsonutils.
Update NovaKeystoneContext to use jsonutils.

Minor fix to use jsonutils.loads instead of json.loads to
standardize w/ the rest of Nova.

Change-Id: I4a6912d29fbe425b29bd1b170b9bec19e3bfc46e

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