normalize function comments
normalize function return values with script return values
implement get_uuid() as special case of get_uuids()
convert get_uuids() calls to get_uuid() where appropriate
use unquoted $# and $? consistently
use bash string substitution instead of sed
omit commas in vm_host() results
use bare variable names instead of array expansion in calls to have_required()
allow optional name/value pairs in get_uuid() and get_uuids()
quote parameter value
check for proper optional arg length in get_uuids()
use get_uuid() instead of get_local_sr_uuid()
remove obsolete function
convert from vm_vif_uuids() to get_uuids()
use object_label() to capitalize object labels when appropriate
convert vm_vbd_uuids() to get_uuids()
convert vbd_vdi_uuid() to get_param()
remove unused function
replace network_pif_vlan() with in-line code
replace vif_network_uuid() with get_param()