kill running bootinfo in bootinfo.restart. Hey, its 6am.

packets are lost; do not send the events if a node has requested
bootinfo within the last 10 seconds; this implies that the bootinfo
reply packet was lost and the node is retrying. This should quiet
things a bit from stated, although eventually this should be dealt
with in stated instead of with this hack.

Mac originally added the cache to proxydhcp. I've added a cache to
bootinfo to solve the same problem (proxydhcp is no longer used),
although I have changed to implementation to use the DBM backend
rather then a one-off hash table. dbopen() with a NULL file argument
creates an in-memory database (no backing store), and I have used the
DB_HASH db type. So, the hash table is done with a couple of calls to
DBM routines.

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,

as defined in the defs-* file (e.g. "TBLOGFACIL=local2").  The default is
"local5" which is what we are setup to use so you shouldn't need to mess
with your defs- file!

perl scripts just get this value configured in when configure is run.
C programs get the value in two ways.  For programs that are intimate with
the testbed infrastructure, and include "config.h", they just get it from
that file.  For programs that we sometimes use outside the Emulab build
environment (e.g., frisbee, capture) and that don't include config.h,
the value is set via a "-DLOG_TESTBED=..." in the GNUmakefile build line.
If the value isn't set, it defaults to what it used to be (usually LOG_USER).

Still to do: healthd, hmcd (whose build doesn't seem to be completely
integrated) and plabdaemon.in (since its icky python :-)

Remove the bootinfo_ack functionality. Nothing uses it and it couldn't properly do the db changes it needed to.

Also copy bootwhat.h from my oskit tree and build from local copy.

is implemented in netdisk (command line mode). If netdisk succeeds,
it will send an ACK packet to bootinfo which causes it to clear the
next_boot_path field in the database so that the next reboot falls
back to def_boot.

add HUPing of daemon to reread any config info