Allows Javelin to specify Swift role
Allows Javelin to specify Swift role

Javelin assumes that the role needed by Swift is 'Member'. This patch
allows the possibility to specify something else, while keeping the
default value to 'Member' if nothing is specified.

Change-Id: I672f3efa8c00d55cc9bb644783e40a11e548018c

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