Modified 404 error response for server actions
Modified 404 error response for server actions

User-friendly messages are returned if any server action
is requested on non-existent servers

Fixes bug 1050922

Change-Id: I884285fcb62225acd9078d16191398d844a227cb

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