Add registry_rename.
Add hypervisor command "vm rename <instance_name> <new_name>".
Fix documentation of hypervisor command vm create.

It was missing the 3rd argument.
Add hypervisor command "nio rename <nio_name> <new_name>".
Add hypervisor command "nio_bridge rename <bridge_name> <new_name>".
Add hypervisor command "frsw rename <switch_name> <new_name>".
Add hypervisor command "atmsw rename <switch_name> <new_name>".
Document when hypervisor mode became available.
Add hypervisor command "atm_bridge rename <bridge_name> <new_name>".
Add hypervisor command "ethsw rename <switch_name> <new_name>".
Add hypervisor command "object_store rename <object_name> <new_name>".
Merge and close issue #21 - Renaming devices