Description of NAS configuration options

Configuration option = Default value	Description
[DEFAULT]
nas_ip =	(StrOpt) IP address or Hostname of NAS system.
nas_login = admin	(StrOpt) User name to connect to NAS system.
nas_password =	(StrOpt) Password to connect to NAS system.
nas_private_key =	(StrOpt) Filename of private key to use for SSH authentication.
nas_ssh_port = 22	(IntOpt) SSH port to use to connect to NAS system.