This will be used by the power command to tell it to try to power on a
machine that fails to "cycle". ipmitool (or IPMI) seems to fail by default
if you try to cycle a powered-off node.

derived from the PHP code.

We were creating snapshots at the wrong time and not maintaining
them correctly.

database, but really, how many more portals are we really going to add?

Via control network.

current.

current.

Allow notes,size,deltasize when creating a new descriptor.

Clear size and deltasize when creating a new version of a descriptor.

enabled.

version of an image, clear hash/deltahash, they have to be initialized
to new values, so lets not leave cruft around.

When zero, we do not set an expiration on passwords.

	tb-set-packing-strategy pack|balance

defaults to null, which means no strategy (whatever assign does).

type one.

the SelfLoader.

type constraints, which means having to calculate type usage for
the experiment swapping in and making sure we do not cause an experiment
to swap out during a swapmod, because a policy changed.

to check the reservation_name in the nodes table; if reserved_pid is
set but reservation_name is null, it was prereserved via the web interface
not via the prereserve command line tool. In this case, we never clear
the pre-reserve, someone has to do that via the web interface.

It was checking the count of database rows (which would always have
been 1), not the count of free addresses.

When creating a pre-reserve, new -n option to specify a name for the
reservation, defaults to "default". All other operations require an
-n option to avoid messing with the wrong reservation. You are not allowed
to reuse a reservation name in a project, of course. Priorities are
probably more important now, we might want to change the default from 0 to
some thing higher, and change all the current priorities.

For bookkeeping, the nodes table now has a reservation_name slot that is
set with the reserved_pid. This allows us to revoke the nodes associated
with a specific reservation. Bonus feature is that when setting the
reserved_pid via the web interface, we leave the reservation_name null, so
those won't ever be revoked by the prereserve command line tool.

New feature; when revoking a pre-reserve, we now look to see if nodes being
revoked are free and can be assigned to other pre-reserves. We used to not
do anything, and so had to wait until that node was allocated and released
later, to see if it could move into a pre-reserve.

Also a change required by node specific reservations; when we free a node,
need to make sure we actually use that node, so have to cycle through all
reservations in priority order until it can used. We did not need to do
this before.

	boss> wap perl prereserve lbsbox pcxxx pcyyy ...

Overall pre-reserve handling is unchanged; if there is a another higher
priority type pre-reserve, it will be filled first. Moral, be sure to think
about the priority argument, which you had to do anyway.

need node_reservations for, well, node_reservations.

unlocked checked, used in the Geni getticket() routine.

Also includes some PhantomNet-specific restrictions (e.g. only
allows use of the main Utah Emulab testbed  aggregate).

This excercise stretched the limits of what we can reasonably do
before introducing real per-testbed branding/policy mechanisms to
the php/web front-end.  My changes ain't exactly pretty...

Please take care when adding any testbed-specific changes to the
code.  There are three flavors now to consider in the logic.