Update comment on RequestExtension class.
Update comment on RequestExtension class.

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