Convert get_console_output length=None to -1 for Nova V3 API calls
Convert get_console_output length=None to -1 for Nova V3 API calls

Nova commit 8e5577f52f660960738f1fc0384dff77fa30fc8a makes the nova v3
get_console_output extension handle unlimited length with -1.

In the nova v2 API the length parameter is optional but the nova v3 API
uses jsonschema validation so it expects a value to check against.

Closes-Bug: #1328582

Change-Id: Ib1ae85e644e08c24aaf0ba2baaa8812286ef0ebd

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