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).

add the BACKFILL parameter to the default delay node kernel. The new Image ID is FBSD410-DEL-DNETMOD.

competing traffic - stemmed the packet losses in rcv buffers. Completely(& unfairly) dominates a competing IPerf TCP flow though.

bunch of bugs, and wasn't working in production use.

Some parts very "hacky", lots of XXX / TODOs.
BARELY tested!!!! Don't use on the production system yet.
Need to verify that things didn't break, especially with the automanager,
the bgmon.pl "outage detection stuff", etc...

See code's todos and also the file
flexlab-canonicalization-misc-notes.txe

At this point:
 - mangerclient & automanagerclient did not change.
 - The manager, when a probe request is received, looks at the DB table
   "tool_spec" to retrieve the proper wrapperpath, formal parameter list, etc..
 - The manager assembles a message and sends it out to the appropriate
   path probers, which operate on the request as they have been
   (no major internal changes to the path probers).
 - The path probers call the toolwrapper to run the tests
 - The toolwrappers return a canonical result for that type of metric.
 - The path probers send the result and the actual parameters used by the
   tool to the data collector.
 - The data collector uses the toolname and actual parameters to get an
   idx number. This idx is stored in the "measured_by" field of this
   measurement's entry in the "pair_data" table.

arguments and result parsing handled by separate application wrappers.
Currently fping and iperf supported.
Not fully functional at this point: user interface needs extending
to support the generalization, as well as getting the results back
to "opsrecv".

Also merged some of Mike's changes to allow for "private" managers
to use during testing.

- latency measurements under 2 second intervals now operate in "continuous"
  mode: a single "ping" process runs per destination, versus the "normal"
  approach of forking a new fping process for each measurement instance.

- Note, that I found a bug which is not fixed in this checkin: if a latency
  test is running in continuous mode and another latency measurement request
  is received with a shorter interval, the "continuous" ping process is not
  re-initialized with the new, shorter interval.

cross-traffic generation in the delay-agent nodes. These changes need to
be applied to FBSD54-DNODE-PUBSUB and delay-agent files from the PELAB branch
in order to create a working delay node image. "ipfw" must also be recompiled with
this modified Dummynet header.

Added a new parameter to the delay-agent event commands -- "BACKFILL", which
is set similar to bandwidth. Amount of link capacity minus backfill is the desired
available bandwidth.

had foolishly not added...

from opsdb or dpdb; you can't ask for more than 12 hours of data; you can
filter by src/dst site/node, basic value constraints.

Also added a command line client to issue requests.

over a fixed interval.  Useful to see if managerclient.pl is working.

has explicitly set it via setexptid

a comment about a place where I'm pretty sure I've got a constant wrong
or something...

but it generally works.

Only prints out messages about going over caps, doesn't reject (At
David's request) commands

NOT stable enough to run in production!

Tried to confine my edits to parts that shouldn't conflict with
Leigh's edits.

asymmetry.