Fix AttributeError exception for API's test_network_lifecycle
Fix AttributeError exception for API's test_network_lifecycle

Change I2be04f600e6bd8d7d78948d25395d8e04fa0dea3 moved the
exception to tempest_lib. We should use the new import.

Closes-bug: #1421454

Change-Id: Id9ec2537261f101b1bed895bfe5ef2943b8548d2

klmitch/neutron,infobloxopen/neutron,antonioUnina/neutron,dims/neutron,wolverineav/neutron,miyakz1192/neutron,bgxavier/neutron,neoareslinux/neutron,MaximNevrov/neutron,MaximNevrov/neutron,antonioUnina/neutron,apporc/neutron,cloudbase/neutron,cloudbase/neutron-virtualbox,yuewko/neutron,dhanunjaya/neutron,skyddv/neutron,jerryz1982/neutron,shahbazn/neutron,eayunstack/neutron,asgard-lab/neutron,barnsnake351/neutron,rdo-management/neutron,mattt416/neutron,mattt416/neutron,cisco-openstack/neutron,swdream/neutron,aristanetworks/neutron,glove747/liberty-neutron,wenhuizhang/neutron,barnsnake351/neutron,yanheven/neutron,watonyweng/neutron,mahak/neutron,pnavarro/neutron,chitr/neutron,magic0704/neutron,bgxavier/neutron,noironetworks/neutron,JianyuWang/neutron,takeshineshiro/neutron,mmnelemane/neutron,waltBB/neutron_read,SamYaple/neutron,asgard-lab/neutron,sasukeh/neutron,pnavarro/neutron,yuewko/neutron,sebrandon1/neutron,SmartInfrastructures/neutron,rdo-management/neutron,javaos74/neutron,sebrandon1/neutron,silenci/neutron,mmnelemane/neutron,eayunstack/neutron,infobloxopen/neutron,eonpatapon/neutron,noironetworks/neutron,silenci/neutron,jacknjzhou/neutron,JioCloud/neutron,JianyuWang/neutron,paninetworks/neutron,neoareslinux/neutron,skyddv/neutron,javaos74/neutron,glove747/liberty-neutron,Stavitsky/neutron,suneeth51/neutron,apporc/neutron,aristanetworks/neutron,klmitch/neutron,openstack/neutron,huntxu/neutron,cisco-openstack/neutron,cloudbase/neutron,magic0704/neutron,yanheven/neutron,NeCTAR-RC/neutron,sasukeh/neutron,bigswitch/neutron,waltBB/neutron_read,openstack/neutron,suneeth51/neutron,chitr/neutron,igor-toga/local-snat,mandeepdhami/neutron,dims/neutron,adelina-t/neutron,SmartInfrastructures/neutron,jacknjzhou/neutron,mandeepdhami/neutron,paninetworks/neutron,jumpojoy/neutron,bigswitch/neutron,adelina-t/neutron,SamYaple/neutron,shahbazn/neutron,swdream/neutron,takeshineshiro/neutron,watonyweng/neutron,cloudbase/neutron-virtualbox,igor-toga/local-snat,vivekanand1101/neutron,alexandrucoman/vbox-neutron-agent,eonpatapon/neutron,NeCTAR-RC/neutron,miyakz1192/neutron,jerryz1982/neutron,openstack/neutron,mahak/neutron,alexandrucoman/vbox-neutron-agent,JioCloud/neutron,mahak/neutron,dhanunjaya/neutron,wolverineav/neutron,jumpojoy/neutron,vivekanand1101/neutron,huntxu/neutron,Stavitsky/neutron,wenhuizhang/neutron