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This commit is intended to makes the license status of Emulab and
ProtoGENI source files more clear.  It replaces license symbols like
"EMULAB-COPYRIGHT" and "GENIPUBLIC-COPYRIGHT" with {{{ }}}-delimited
blocks that contain actual license statements.

This change was driven by the fact that today, most people acquire and
track Emulab and ProtoGENI sources via git.

Before the Emulab source code was kept in git, the Flux Research Group
at the University of Utah would roll distributions by making tar
files.  As part of that process, the Flux Group would replace the
license symbols in the source files with actual license statements.

When the Flux Group moved to git, people outside of the group started
to see the source files with the "unexpanded" symbols.  This meant
that people acquired source files without actual license statements in
them.  All the relevant files had Utah *copyright* statements in them,
but without the expanded *license* statements, the licensing status of
the source files was unclear.

This commit is intended to clear up that confusion.

Most Utah-copyrighted files in the Emulab source tree are distributed
under the terms of the Affero GNU General Public License, version 3
(AGPLv3).

Most Utah-copyrighted files related to ProtoGENI are distributed under
the terms of the GENI Public License, which is a BSD-like open-source
license.

Some Utah-copyrighted files in the Emulab source tree are distributed
under the terms of the GNU Lesser General Public License, version 2.1
(LGPL).

For InstaGeni, need to record and be able to search for history by
control net mac address. We now record this in the node_history table,
with corresponding change to the ShowNodeHistory web page.

The backend changes required are that we 1) actually generate a mac
address for VMs and stick it into the interfaces record, 2) return
that mac from tmcd in the jailconfig, and 3) have the openvz library
create the control net interface using that mac.

On the openvz image, needed to switch to using a control network
bridge for all interfaces (not just routable ones) so that traffic
leaves the node with the correct mac.

loopfree path from a set of trunk links.

Silly place for this, but I need it in libvtop.

capturing and returning all output. Convenient.

This is a fer-now hack.  Perl 5.10 has issues with bogus taint check
triggers that appear quite often when using the SelfLoader.  Now if you put:
    SELFLOADER_DATA=""
In your defs-* file, it will disable the uses that cause problems.  Yes,
the configure script should figure out if this is needed for you, but...
another time.

a coderef of it. Not sure why it does not work yet.

starting any one of our scripts can take a second or two. That time is
spent including and compiling 10000s of thousands of lines of perl
code, both from our libraries and from the perl libraries.

Mostly this is just a maintenance thing; we just never thought about
it much and we have a lot more code these days.

So I have done two things.

1) I have used SelfLoader() on some of our biggest perl modules.
   SelfLoader delays compilation until code is used. This is not as
   good as AutoLoader() though, and so I did it with just a few 
   modules (the biggest ones).

2) Mostly I reorganized things:

  a) Split libdb into an EmulabConstants module and all the rest of
     the code, which is slowly getting phased out.

  b) Move little things around to avoid including libdb or Experiment
     (the biggest files).

  c) Change "use foo" in many places to a "require foo" in the
     function that actually uses that module. This was really a big
     win cause we have dozens of cases where we would include a
     module, but use it in only one place and typically not all.

Most things are now starting up in 1/3 the time. I am hoping this will
help to reduce the load spiking we see on boss, and also help with the
upcoming Geni tutorial (which kill boss last time).

original code in node_reboot/vnode_setup to fork off a bunch
of children. Does pretty much the same thing, but is generalized
to allow it to be used in any context via code references (which in
perl are also closures!).

the existing DB format.