VMware: add unit tests for vmops attach and detach interface
VMware: add unit tests for vmops attach and detach interface

Add extra unit tests for the attach and detach of interfaces.

Change-Id: Iaec00aa2b319ac8ecafd3c225e09385c28662304

vmturbo/nova,mmnelemane/nova,CloudServer/nova,whitepages/nova,mahak/nova,jianghuaw/nova,zaina/nova,sebrandon1/nova,edulramirez/nova,ruslanloman/nova,devendermishrajio/nova_test_latest,Juniper/nova,klmitch/nova,mikalstill/nova,ted-gould/nova,gooddata/openstack-nova,iuliat/nova,jianghuaw/nova,nikesh-mahalka/nova,raildo/nova,rajalokan/nova,openstack/nova,scripnichenko/nova,rahulunair/nova,mahak/nova,watonyweng/nova,Juniper/nova,zhimin711/nova,Juniper/nova,klmitch/nova,sebrandon1/nova,vmturbo/nova,tudorvio/nova,varunarya10/nova_test_latest,gooddata/openstack-nova,apporc/nova,yosshy/nova,whitepages/nova,zaina/nova,JianyuWang/nova,hanlind/nova,zzicewind/nova,phenoxim/nova,j-carpentier/nova,shail2810/nova,edulramirez/nova,gooddata/openstack-nova,openstack/nova,watonyweng/nova,BeyondTheClouds/nova,iuliat/nova,rajalokan/nova,vmturbo/nova,akash1808/nova_test_latest,barnsnake351/nova,j-carpentier/nova,JioCloud/nova_test_latest,klmitch/nova,CEG-FYP-OpenStack/scheduler,CCI-MOC/nova,shail2810/nova,Tehsmash/nova,alaski/nova,akash1808/nova_test_latest,jeffrey4l/nova,phenoxim/nova,cernops/nova,felixma/nova,CloudServer/nova,rajalokan/nova,cloudbase/nova,TwinkleChawla/nova,BeyondTheClouds/nova,NeCTAR-RC/nova,openstack/nova,zzicewind/nova,mikalstill/nova,cernops/nova,rahulunair/nova,cyx1231st/nova,raildo/nova,CCI-MOC/nova,takeshineshiro/nova,dims/nova,Francis-Liu/animated-broccoli,eonpatapon/nova,ruslanloman/nova,rajalokan/nova,varunarya10/nova_test_latest,Tehsmash/nova,JioCloud/nova_test_latest,bigswitch/nova,devendermishrajio/nova,jeffrey4l/nova,yosshy/nova,fnordahl/nova,jianghuaw/nova,TwinkleChawla/nova,JianyuWang/nova,cloudbase/nova,ted-gould/nova,klmitch/nova,nikesh-mahalka/nova,zhimin711/nova,isyippee/nova,mahak/nova,barnsnake351/nova,Juniper/nova,tudorvio/nova,isyippee/nova,hanlind/nova,devendermishrajio/nova,sebrandon1/nova,eonpatapon/nova,cernops/nova,dims/nova,BeyondTheClouds/nova,rahulunair/nova,apporc/nova,CEG-FYP-OpenStack/scheduler,jianghuaw/nova,felixma/nova,hanlind/nova,MountainWei/nova,mikalstill/nova,vmturbo/nova,bigswitch/nova,NeCTAR-RC/nova,noironetworks/nova,LoHChina/nova,devendermishrajio/nova_test_latest,takeshineshiro/nova,scripnichenko/nova,MountainWei/nova,cyx1231st/nova,LoHChina/nova,gooddata/openstack-nova,noironetworks/nova,Francis-Liu/animated-broccoli,mmnelemane/nova,fnordahl/nova,cloudbase/nova,alaski/nova