Add user/tenant shim to RequestContext
Add user/tenant shim to RequestContext

This is necessary because we pass the Nova context object to
openstack-common/code (logging, for example), which expects the
attributes to be named user/tenant not user_id/project_id.

Fixes bug 1098278

Change-Id: Ic0dc49ef54515fc0ffaa0895cf4d88701afb1e16

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