Comment 1 for bug 1661731

According to nova-sched.log nova-sched could not find valid host on ComputeFilter:

Filter results: ['RetryFilter: (start: 1, end: 1)', 'AvailabilityZoneFilter: (start: 1, end: 1)', 'RamFilter: (start: 1, end: 1)', 'DiskFilter: (start: 1, end: 1)', 'ComputeFilter: (start: 1, end: 0)']

because the host is disabled due to "Connection to libvirt lost" like

(ubuntu-xenial-bluebox-sjc1-7106549, ubuntu-xenial-bluebox-sjc1-7106549) ram: 7086MB disk: 49152MB io_ops: 4 instances: 5 is disabled, reason: AUTO: Connection to libvirt lost: 0 host_passes

from nova-sched.log