Fixes HostTestCase failures due to slow test run
Fixes HostTestCase failures due to slow test run

Status check in _list_hosts() fails if tests take longer than the
service_down_time.

Stubbing utcnow() guarantees that status check passes for tests.

Change-Id: I188443730ce077a8117812f1089db36ece184e7a
Closes-Bug: 1292643

cloudbase/cinder,alex8866/cinder,rakeshmi/cinder,potsmaster/cinder,Datera/cinder,redhat-openstack/cinder,nexusriot/cinder,takeshineshiro/cinder,NetApp/cinder,Accelerite/cinder,j-griffith/cinder,duhzecca/cinder,scottdangelo/RemoveVolumeMangerLocks,abusse/cinder,scality/cinder,dims/cinder,bswartz/cinder,phenoxim/cinder,manojhirway/ExistingImagesOnNFS,nexusriot/cinder,tlakshman26/cinder-https-changes,sasukeh/cinder,Datera/cinder,dims/cinder,nikesh-mahalka/cinder,julianwang/cinder,JioCloud/cinder,Akrog/cinder,Hybrid-Cloud/cinder,Paul-Ezell/cinder-1,github-borat/cinder,CloudServer/cinder,abusse/cinder,Akrog/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,Accelerite/cinder,tlakshman26/cinder-new-branch,phenoxim/cinder,blueboxgroup/cinder,tlakshman26/cinder-https-changes,Thingee/cinder,saeki-masaki/cinder,eharney/cinder,leilihh/cinder,NetApp/cinder,blueboxgroup/cinder,eharney/cinder,hguemar/cinder,julianwang/cinder,Thingee/cinder,alex8866/cinder,sasukeh/cinder,redhat-openstack/cinder,Hybrid-Cloud/cinder,takeshineshiro/cinder,scality/cinder,Thingee/cinder,github-borat/cinder,mahak/cinder,apporc/cinder,winndows/cinder,petrutlucian94/cinder,openstack/cinder,cloudbase/cinder,petrutlucian94/cinder,rakeshmi/cinder,mahak/cinder,Paul-Ezell/cinder-1,hguemar/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,bswartz/cinder,Nexenta/cinder,leilihh/cinder,openstack/cinder,j-griffith/cinder,tlakshman26/cinder-new-branch,JioCloud/cinder,ge0rgi/cinder,winndows/cinder,duhzecca/cinder,scottdangelo/RemoveVolumeMangerLocks,manojhirway/ExistingImagesOnNFS,Nexenta/cinder,nikesh-mahalka/cinder,saeki-masaki/cinder,CloudServer/cinder,apporc/cinder,potsmaster/cinder