nova: use RequestContextSerializer for notifications
nova: use RequestContextSerializer for notifications

RequestContext should be serialized when sent via oslo.messaging. The
serializer is correctly used for the general RPC mechanism, but has been
forgotten in the notifier. This patch fixes that.

Change-Id: I56fa8022e34c0e80835e3bde940fda99ed0f9ba8
Closes-Bug: #1275771

edulramirez/nova,JioCloud/nova,adelina-t/nova,cyx1231st/nova,leilihh/novaha,leilihh/nova,belmiromoreira/nova,maelnor/nova,luogangyi/bcec-nova,JianyuWang/nova,sebrandon1/nova,OpenAcademy-OpenStack/nova-scheduler,mahak/nova,apporc/nova,tealover/nova,leilihh/nova,Stavitsky/nova,openstack/nova,nikesh-mahalka/nova,klmitch/nova,shahar-stratoscale/nova,eonpatapon/nova,luogangyi/bcec-nova,vladikr/nova_drafts,CiscoSystems/nova,petrutlucian94/nova,virtualopensystems/nova,alexandrucoman/vbox-nova-driver,dawnpower/nova,saleemjaveds/https-github.com-openstack-nova,alaski/nova,yosshy/nova,maelnor/nova,badock/nova,sebrandon1/nova,phenoxim/nova,j-carpentier/nova,LoHChina/nova,cernops/nova,rajalokan/nova,mahak/nova,spring-week-topos/nova-week,akash1808/nova_test_latest,cloudbase/nova,silenceli/nova,varunarya10/nova_test_latest,apporc/nova,rajalokan/nova,takeshineshiro/nova,akash1808/nova_test_latest,felixma/nova,TwinkleChawla/nova,akash1808/nova,CloudServer/nova,berrange/nova,viggates/nova,TwinkleChawla/nova,OpenAcademy-OpenStack/nova-scheduler,ewindisch/nova,takeshineshiro/nova,petrutlucian94/nova,CEG-FYP-OpenStack/scheduler,mahak/nova,ted-gould/nova,devendermishrajio/nova_test_latest,ruslanloman/nova,openstack/nova,BeyondTheClouds/nova,devendermishrajio/nova,Metaswitch/calico-nova,yatinkumbhare/openstack-nova,vladikr/nova_drafts,openstack/nova,yatinkumbhare/openstack-nova,kimjaejoong/nova,mikalstill/nova,tudorvio/nova,tianweizhang/nova,watonyweng/nova,alvarolopez/nova,noironetworks/nova,MountainWei/nova,CCI-MOC/nova,hanlind/nova,adelina-t/nova,fnordahl/nova,jianghuaw/nova,mmnelemane/nova,JioCloud/nova_test_latest,projectcalico/calico-nova,Juniper/nova,watonyweng/nova,Juniper/nova,barnsnake351/nova,leilihh/novaha,cloudbase/nova,cyx1231st/nova,bigswitch/nova,zhimin711/nova,silenceli/nova,barnsnake351/nova,ewindisch/nova,gooddata/openstack-nova,alaski/nova,whitepages/nova,zaina/nova,raildo/nova,dawnpower/nova,Tehsmash/nova,rrader/nova-docker-plugin,gooddata/openstack-nova,petrutlucian94/nova_dev,shail2810/nova,tealover/nova,gooddata/openstack-nova,alvarolopez/nova,petrutlucian94/nova_dev,Stavitsky/nova,Yusuke1987/openstack_template,Francis-Liu/animated-broccoli,dims/nova,CEG-FYP-OpenStack/scheduler,BeyondTheClouds/nova,blueboxgroup/nova,klmitch/nova,ruslanloman/nova,raildo/nova,zhimin711/nova,cloudbase/nova-virtualbox,NeCTAR-RC/nova,nikesh-mahalka/nova,CCI-MOC/nova,viggates/nova,mikalstill/nova,j-carpentier/nova,cloudbase/nova-virtualbox,devoid/nova,sebrandon1/nova,projectcalico/calico-nova,isyippee/nova,jeffrey4l/nova,rajalokan/nova,affo/nova,redhat-openstack/nova,vmturbo/nova,thomasem/nova,zaina/nova,zzicewind/nova,orbitfp7/nova,mandeepdhami/nova,tanglei528/nova,dims/nova,rahulunair/nova,belmiromoreira/nova,shahar-stratoscale/nova,bigswitch/nova,devoid/nova,MountainWei/nova,tangfeixiong/nova,gooddata/openstack-nova,yosshy/nova,mmnelemane/nova,NeCTAR-RC/nova,rahulunair/nova,double12gzh/nova,mgagne/nova,Juniper/nova,jianghuaw/nova,iuliat/nova,mandeepdhami/nova,mgagne/nova,tudorvio/nova,fnordahl/nova,JianyuWang/nova,cloudbase/nova,virtualopensystems/nova,vmturbo/nova,Tehsmash/nova,spring-week-topos/nova-week,klmitch/nova,affo/nova,JioCloud/nova,devendermishrajio/nova_test_latest,rajalokan/nova,angdraug/nova,hanlind/nova,noironetworks/nova,saleemjaveds/https-github.com-openstack-nova,eayunstack/nova,Yusuke1987/openstack_template,cernops/nova,LoHChina/nova,bgxavier/nova,tianweizhang/nova,shail2810/nova,eharney/nova,angdraug/nova,berrange/nova,iuliat/nova,klmitch/nova,alexandrucoman/vbox-nova-driver,CloudServer/nova,ted-gould/nova,CiscoSystems/nova,Juniper/nova,eayunstack/nova,rrader/nova-docker-plugin,BeyondTheClouds/nova,thomasem/nova,cernops/nova,kimjaejoong/nova,eharney/nova,varunarya10/nova_test_latest,isyippee/nova,Metaswitch/calico-nova,orbitfp7/nova,bgxavier/nova,zzicewind/nova,blueboxgroup/nova,eonpatapon/nova,mikalstill/nova,JioCloud/nova_test_latest,phenoxim/nova,jianghuaw/nova,edulramirez/nova,vmturbo/nova,devendermishrajio/nova,double12gzh/nova,vmturbo/nova,rahulunair/nova,hanlind/nova,jeffrey4l/nova,felixma/nova,redhat-openstack/nova,badock/nova,Francis-Liu/animated-broccoli,whitepages/nova,jianghuaw/nova,tangfeixiong/nova,joker946/nova,scripnichenko/nova,akash1808/nova,joker946/nova,scripnichenko/nova,tanglei528/nova