Add delete_net_interface function
Add delete_net_interface function

This commit adds a new function that deletes a specific
tap device. This bug fix is targeted for Havana.

Change-Id: I26be5d94550db35358caae642fb9000953346826
fixes: bug #1138408

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