- don't rely on awk to support Posix character classes, as mawk doesn't

- don't rely on awk to support Posix character classes, as mawk doesn't
  support them; use [ \t] instead
- don't use cirros as default image name (which might conflict with
  previous run), instead add a random number as a suffix
- cinderclient 1.0.9 doesn't use name parameter in cinder.volumes.create()
- on Cinder API error (for instance hitting the block quota)
  v.display_name will be None and unusable for comparison
- when booting instances, if src_vol.display_name in template volume is
  None, use generic template name for display_name
- fix invalid exception handling/printing in delete_instances.py and
  delete_volumes.py
- delete all available volumes and instances in delete_instances.py and
  delete_volumes.py, instead of just errored ones (assuming that was the
  point of cleanup scripts)
- handle uppercase and lowercase statuses in delete_instances.py and
  delete_volumes.py