improve sessions around floating_ip_get_by_address
improve sessions around floating_ip_get_by_address

improve session handling around calls to floating_ip_get_by_address.
Removed 'session' parameter from public method calls, and replaced
private calls with new method _floating_ip_get_by_address.

Some existing calls to floating_ip_get_by_address were easily rewritten
into a simple model_query().update() call and thus removed. Others can
be cleaned up later.

blueprint db-cleanup

Change-Id: I4db11e6d7fda43420bca800c44c34efdefb8038a

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