Silence logs when associated models aren't found.  Also document methods used ofr associating things.  And get rid of some duplicated code.
Silence logs when associated models aren't found.  Also document methods used ofr associating things.  And get rid of some duplicated code.

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