update openstack metadata poller to check vm poll time before attemping to clean up VMs
update openstack metadata poller to check vm poll time before attemping to clean up VMs

also several other minor bugfixes:
failed to skip to next cloud after detecting a bad auth_url

hep-gc/cloudscheduler,hep-gc/cloudscheduler,hep-gc/cloudscheduler,hep-gc/cloudscheduler