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Mac's statewait library to wait for nodes to through a MFSETUP,ISUP
transition. This ensures that the nodes actually came up in the MFS,
and not something else. No retry; just exit with failure if any node
fails.

	Usage: node_admin [-h] [-n | -w] <on | off> [node ....]
	       node_admin [-h] [-n | -w] -p pid,eid <on | off>
	-h   This message
	-n   Do not reboot node
	-w   Wait for node to come back up if rebooted
	-e   Operate on all nodes in an experiment

Add explicit -w option to wait for node to reboot.

filename to boot, and all local nodes will boot the same pxeboot kernel,
which has been extended to allow for jumping directly into a specific MFS
(in addition to the usual testbed boot into a partition or multiboot
kernel).

Bootinfo and the bootwhat protocol extended to tell the client node what
MFS to jump into directly, without a reboot. pxe_boot_path and
next_pxe_boot_path are now deprecated, with bootinfo used to control which
MFS to boot. Nodes now boot a single pxeboot kernel, and bootinfo tells
them what to do next.

Bootinfo greatly simplifed. temp_boot_osid has been added to allow for
temporary booting of different kernels (such as with ndoe_admin or
create_image). Unlike next_boot_osid which is a one-shot boot,
temp_boot_osid causes the node to boot that OS until told not too.

next_boot_path and def_boot_path in the nodes table are now ignored.
Bootinfo gets path info strictly from the os_info table entry for the osid
given in one of def_boot_osid, temp_boot_osid, or next_boot_osid.  This
makes the selection of what to do in bootinfo a lot simpler (and for
TBBootWhat in libdb). The os_info table also modified to include an MFS
flag so that bootinfo knows to tell the client that the path refers to an
MFS and not a multiboot kernel.

Change to boot sequence; free nodes no longer boot into the default OSID.
Instead, they are told to wait in pxeboot until told what to do, which
will typically be when the node is allocated and a specific OSID
picked. If the node needs to be reloaded, then the node is told to jump
directly into the Frisbee MFS, which saves one complete reboot cycle
whether the node has the requested OS installed, or not.  New program
added called "bootinfosend" that is used by node_reboot to "wake up" up
nodes sitting in pxewait mode, so that they query bootinfo again and boot.

node_reboot changed to look at the event state of a node, and use
bootinfosend to wake up nodes, rather then power cycle, since pxeboot does
not repsond to pings. Retry (if the UDP packet is lost) is handled by
stated.

Event support added to bootinfo, to replace the event generation that was
in proxydhcp. I have not included the caching that Mac had in proxydhcp
since it does not appear that bootinfo packets are lost very
often. Cleaned up all of the event and DB queury code to use lib/libtb for
DB access, and moved all of the event code into a separate file.  The
event sequence when a node boots now looks like this:

	'SHUTDOWN'    --> 'PXEBOOTING'  (BootInfo)
	'PXEBOOTING', --> 'PXEBOOTING'  (BootInfo Retry)
	'PXEBOOTING', --> 'BOOTING'     (Node Not Free)
	'PXEBOOTING', --> 'PXEWAIT'     (Node is Free)
	'PXEWAIT',    --> 'PXEWAKEUP'   (Node Allocated)
	'PXEWAKEUP',  --> 'PXEWAKEUP'   (Bootinfo Retry)
	'PXEWAKEUP',  --> 'PXEBOOTING'  (Node Woke Up)

Change stated to support resending PXEWAKEUP events when node times out.
After 3 tries, node is power cycled. Other minor cleanup in stated.

Clean up and simplify os_select, while adding support for temp_next_boot
and removing all trace of def_boot_path and next_boot_path processing.
Remove all pxe_boot_path and next_pxe_boot_path processing.  Changed
command line interface to support "clearing" fields. For example,
node_admin changed to call os_select like this to have the node
temporarily boot the FreeBSD MFS:

	os_select -t FREEBSD-MFS pcXXX

which sets temp_boot_osid. To turn admin mode off:

	os_select -c -t pcXXX

which says to clear temp_boot_osid.

sql/database-fill-supplemental.sql modifed to add os_info table
entries for the FreeBSD, Frisbee, and newnode MFS's.

Be sure to change dhcpd config, restart dhcp, kill proxydhcp, restart
bootinfo,

Changes to watch out for:

- db calls that change boot info in nodes table are now calls to os_select

- whenever you want to change a node's pxe boot info, or def or next boot
osids or paths, use os_select.

- when you need to wait for a node to reach some point in the boot process
(like ISUP), check the state in the database using the lib calls

- Proxydhcp now sends a BOOTING state for each node that it talks to.

- OSs that don't send ISUP will have one generated for them by stated
either when they ping (if they support ping) or immediately after they get
to BOOTING.

- States now have timeouts. Actions aren't currently carried out, but they
will be soon. If you notice problems here, let me know... we're still
tuning it. (Before all timeouts were set to "none" in the db)

One temporary change:

- While I make our new free node manager daemon (freed), all nodes are
forced into reloading when they're nfreed and the calls to reset the os
are disabled (that will move into freed).

request.

testbed boot process and the freebsd pxeboot/MFS kernel. I'm hoping
this will be useful enough for users to load their own disk images,
but we shall see. Usage is simple:

	/usr/testbed/bin/node_admin on|off pcXXX

The "on" state boots the MFS, and the "off" states sets it back to
normal.