Add License to Tempest.
Add License to Tempest.

Add Apache License to Tempest. Fix bug 979172.

Change-Id: Ia23f590bbb1f299916ede35693ec184c9b6d6c62

roopali8/tempest,manasi24/tempest,izadorozhna/tempest,roopali8/tempest,tonyli71/tempest,vedujoshi/tempest,danielmellado/tempest,hpcloud-mon/tempest,flyingfish007/tempest,eggmaster/tempest,bigswitch/tempest,manasi24/tempest,NexusIS/tempest,Vaidyanath/tempest,masayukig/tempest,LIS/lis-tempest,CiscoSystems/tempest,hayderimran7/tempest,jaspreetw/tempest,citrix-openstack-build/tempest,tudorvio/tempest,Lilywei123/tempest,Tesora/tesora-tempest,jamielennox/tempest,flyingfish007/tempest,armando-migliaccio/tempest,yamt/tempest,itskewpie/tempest,eggmaster/tempest,hayderimran7/tempest,dkalashnik/tempest,rakeshmi/tempest,itskewpie/tempest,CiscoSystems/tempest,akash1808/tempest,vedujoshi/tempest,alinbalutoiu/tempest,citrix-openstack/build-tempest,Juniper/tempest,neerja28/Tempest,pczerkas/tempest,dkalashnik/tempest,vmahuli/tempest,vedujoshi/os_tempest,ntymtsiv/tempest,xbezdick/tempest,ebagdasa/tempest,LIS/lis-tempest,ebagdasa/tempest,manasi24/jiocloud-tempest-qatempest,queria/my-tempest,Juniper/tempest,bigswitch/tempest,adkerr/tempest,cloudbase/lis-tempest,varunarya10/tempest,afaheem88/tempest_neutron,BeenzSyed/tempest,rakeshmi/tempest,cisco-openstack/tempest,izadorozhna/tempest,rzarzynski/tempest,rzarzynski/tempest,xbezdick/tempest,varunarya10/tempest,hpcloud-mon/tempest,cloudbase/lis-tempest,pandeyop/tempest,akash1808/tempest,JioCloud/tempest,Vaidyanath/tempest,openstack/tempest,afaheem88/tempest,NexusIS/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,Juraci/tempest,masayukig/tempest,adkerr/tempest,ntymtsiv/tempest,vmahuli/tempest,Lilywei123/tempest,afaheem88/tempest_neutron,redhat-cip/tempest,citrix-openstack/build-tempest,pczerkas/tempest,cisco-openstack/tempest,Mirantis/tempest,tonyli71/tempest,citrix-openstack-build/tempest,armando-migliaccio/tempest,Mirantis/tempest,Tesora/tesora-tempest,neerja28/Tempest,queria/my-tempest,Juraci/tempest,nunogt/tempest,afaheem88/tempest,BeenzSyed/tempest,jamielennox/tempest,alinbalutoiu/tempest,manasi24/jiocloud-tempest-qatempest,sebrandon1/tempest,jaspreetw/tempest,danielmellado/tempest,sebrandon1/tempest,pandeyop/tempest,tudorvio/tempest,zsoltdudas/lis-tempest,nunogt/tempest,zsoltdudas/lis-tempest,openstack/tempest,yamt/tempest,JioCloud/tempest,redhat-cip/tempest,vedujoshi/os_tempest