Use pretty tox with the ``all`` env
Use pretty tox with the ``all`` env

The all entry is usable for running custom set of test
cases selected by a regexp in similar venv
as the gate uses with tox -eall.

The pretty tox helps you to see some basic results before,
 the test suite finished.

Change-Id: I553e450ad0a59308be0bfa24aa66877cdb6667da

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