Remove unnecessary logging from API
Remove unnecessary logging from API

When retrieving a list with a lot of instances (thousands), a
significant part of the time is spent logging debug messages.
These messages don't provide much value anymore and just slow
things down unnecessarily.

Change-Id: I52cbec2b236bac587776c8a56e0f8dcae05294cf

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