More Javelin Unit tests
More Javelin Unit tests

Improving unit test coverage of javelin2.
Keep on truckin'!

Adds tests covering volumes manipulation:

* Volumes: create/destroy/attach

Change-Id: Ia661db77e3a4c9d75514c4a292112a4979969ecc

hayderimran7/tempest,nunogt/tempest,tonyli71/tempest,hayderimran7/tempest,alinbalutoiu/tempest,dkalashnik/tempest,masayukig/tempest,LIS/lis-tempest,tonyli71/tempest,openstack/tempest,sebrandon1/tempest,cisco-openstack/tempest,jaspreetw/tempest,yamt/tempest,tudorvio/tempest,rakeshmi/tempest,manasi24/jiocloud-tempest-qatempest,vedujoshi/tempest,zsoltdudas/lis-tempest,JioCloud/tempest,pandeyop/tempest,dkalashnik/tempest,pandeyop/tempest,manasi24/tempest,JioCloud/tempest,afaheem88/tempest,openstack/tempest,akash1808/tempest,jaspreetw/tempest,redhat-cip/tempest,varunarya10/tempest,Tesora/tesora-tempest,manasi24/jiocloud-tempest-qatempest,roopali8/tempest,cisco-openstack/tempest,yamt/tempest,Tesora/tesora-tempest,neerja28/Tempest,zsoltdudas/lis-tempest,flyingfish007/tempest,pczerkas/tempest,Juraci/tempest,nunogt/tempest,NexusIS/tempest,Juniper/tempest,xbezdick/tempest,sebrandon1/tempest,alinbalutoiu/tempest,xbezdick/tempest,vedujoshi/tempest,LIS/lis-tempest,flyingfish007/tempest,bigswitch/tempest,rakeshmi/tempest,neerja28/Tempest,NexusIS/tempest,roopali8/tempest,varunarya10/tempest,afaheem88/tempest,redhat-cip/tempest,masayukig/tempest,pczerkas/tempest,akash1808/tempest,Juraci/tempest,izadorozhna/tempest,izadorozhna/tempest,manasi24/tempest,bigswitch/tempest,Juniper/tempest,tudorvio/tempest