(plumbing for disk agents).

doing the real/hard work. Anyway, in your NS file you can do this:

	set newdisk [new Disk $ns]
	$newdisk set node $n0
	$newdisk set type foo
	$newdisk set mountpoint /qq
	$newdisk set parameters "foo bar fee"
	$newdisk set command "bla bla bla"

The parameters and command are optional and default to null. Then on
your node, tmcd returns:

	DISK DISKNAME=newdisk DISKTYPE='foo' MOUNTPOINT='/qq' MOUNTPOINT='foo bar fee' PARAMETERS='bla bla bla'

Note that there is no client support code in this commit.

This reverts commit 79d43b7d0d119416ce6583eb5f69d22717865846.

_display_info prints the status and related information about the virtual disk created.

Fixed the query for server name, ip, and mac so that it works with
multiple subbosses.  Previously the query would fail due to the
subquery returning multiple rows.

Since the default FORWARD policy is to DROP, only send packets to the
INSIDE chain if:

A) they come in on the vlan interface and
B) they have src IPs in the control net (or brodcast IP)

Packets that match the first but not the second will fall through and
be dropped.