Fix deletion action failure handling
Fix deletion action failure handling

If during handling action some exception occurs, it cause
traceback in logs. It happens because of
wrong formatting in log.warning. This patch resolves this issue.

Change-Id: I039fde6e6c8625b8dd4fd0ca40224c1f3c60c26c
Closes-bug: 1470826
henaras/horizon,mdavid/horizon,dan1/horizon-proto,dan1/horizon-x509,endorphinl/horizon,maestro-hybrid-cloud/horizon,ChameleonCloud/horizon,takeshineshiro/horizon,redhat-cip/horizon,django-leonardo/horizon,karthik-suresh/horizon,davidcusatis/horizon,vladryk/horizon,endorphinl/horizon-fork,maestro-hybrid-cloud/horizon,Mirantis/mos-horizon,Tesora/tesora-horizon,yeming233/horizon,Tesora/tesora-horizon,damien-dg/horizon,doug-fish/horizon,philoniare/horizon,damien-dg/horizon,davidcusatis/horizon,Tesora/tesora-horizon,gerrive/horizon,endorphinl/horizon,endorphinl/horizon-fork,FNST-OpenStack/horizon,j4/horizon,BiznetGIO/horizon,mdavid/horizon,openstack/horizon,saydulk/horizon,NeCTAR-RC/horizon,endorphinl/horizon-fork,philoniare/horizon,philoniare/horizon,Tesora/tesora-horizon,anthonydillon/horizon,redhat-openstack/horizon,takeshineshiro/horizon,Mirantis/mos-horizon,BiznetGIO/horizon,redhat-cip/horizon,doug-fish/horizon,bac/horizon,redhat-cip/horizon,openstack/horizon,bac/horizon,dan1/horizon-proto,dan1/horizon-x509,noironetworks/horizon,ChameleonCloud/horizon,saydulk/horizon,newrocknj/horizon,tqtran7/horizon,xinwu/horizon,Mirantis/mos-horizon,xinwu/horizon,newrocknj/horizon,ChameleonCloud/horizon,doug-fish/horizon,vladryk/horizon,watonyweng/horizon,coreycb/horizon,Dark-Hacker/horizon,tqtran7/horizon,Metaswitch/horizon,NeCTAR-RC/horizon,henaras/horizon,henaras/horizon,maestro-hybrid-cloud/horizon,FNST-OpenStack/horizon,xinwu/horizon,watonyweng/horizon,bigswitch/horizon,idjaw/horizon,watonyweng/horizon,django-leonardo/horizon,anthonydillon/horizon,endorphinl/horizon-fork,karthik-suresh/horizon,coreycb/horizon,redhat-openstack/horizon,redhat-cip/horizon,henaras/horizon,NeCTAR-RC/horizon,bigswitch/horizon,django-leonardo/horizon,idjaw/horizon,maestro-hybrid-cloud/horizon,doug-fish/horizon,newrocknj/horizon,wolverineav/horizon,anthonydillon/horizon,ChameleonCloud/horizon,gerrive/horizon,davidcusatis/horizon,vladryk/horizon,damien-dg/horizon,dan1/horizon-proto,dan1/horizon-x509,Dark-Hacker/horizon,bac/horizon,noironetworks/horizon,dan1/horizon-x509,wolverineav/horizon,gerrive/horizon,j4/horizon,bac/horizon,dan1/horizon-proto,watonyweng/horizon,Metaswitch/horizon,redhat-openstack/horizon,idjaw/horizon,BiznetGIO/horizon,bigswitch/horizon,anthonydillon/horizon,karthik-suresh/horizon,davidcusatis/horizon,mdavid/horizon,tqtran7/horizon,sandvine/horizon,BiznetGIO/horizon,yeming233/horizon,gerrive/horizon,endorphinl/horizon,j4/horizon,bigswitch/horizon,NeCTAR-RC/horizon,saydulk/horizon,sandvine/horizon,Metaswitch/horizon,noironetworks/horizon,damien-dg/horizon,idjaw/horizon,vladryk/horizon,django-leonardo/horizon,philoniare/horizon,j4/horizon,sandvine/horizon,openstack/horizon,coreycb/horizon,yeming233/horizon,redhat-openstack/horizon,Mirantis/mos-horizon,wolverineav/horizon,xinwu/horizon,takeshineshiro/horizon,yeming233/horizon,openstack/horizon,FNST-OpenStack/horizon,takeshineshiro/horizon,sandvine/horizon,noironetworks/horizon,karthik-suresh/horizon,saydulk/horizon,tqtran7/horizon,FNST-OpenStack/horizon,wolverineav/horizon,coreycb/horizon,Metaswitch/horizon,mdavid/horizon,Dark-Hacker/horizon,newrocknj/horizon,Dark-Hacker/horizon,endorphinl/horizon