I don't know what I like most about this module, working with Expect or
handling XML namespaces... Includes the basics of the Netconf protocol.
Only tested with HP Netconf-over-ssh (Comware)!

Main interface calls:

$ncobj = snmpit_libNetconf->new($switch, $userpass, $port, $debuglvl)

Create a new Netconf library object, pointed at switch host $switch.
Username with optional password are passed as second argument (delimit
with ':'). $port is port to connect to, and $debuglvl is the debugging
level. Last two arguments are optional.

$ncobj->doGet($filter)

Execute Netconf "Get", with optional Netconf XML filter argument.

$ncobj->doGetConfig($filter, $source)

Get entire switch config, or partial config if $filter is supplied.
$source is which config (running or saved).  Arguments are optional.

$ncobj->doEditConfig($xmlconf, $target, $defop);

Edit the switch's config.  $xmlconf is an XML::LibXML::Node object
containing the XML-encoded configuration update. $target identifies what
to apply it to (running or startup. Defaults to running). $defop is the
default operation (merge, replace, none. Defaults to "merge").  Last two
arguments are optional.

$ncobj->doRPC($cmd, $xmlarg)

Generic RPC dispatcher (Used by the other "do" commands above).  $cmd is
the rpc command to execute. Optional $xmlarg parameter is an
XML:LibXML::Node object that encodes the arguments to $cmd.