Needed when boss is the tip server (i.e., for IPMI consoles).

Somehow this vaguely feels like a potential flaw. Prior to this,
a misconfigured sshtb command that specified boss would fail.
Now it will succeed and run in the one place it can cause the
most damage.

Also, fix a couple of nits in the console code.

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).

node. There auth method has to be ssh-key in the DB, since I did not
feel like dealing with password auth and the required tty stuff.

virtual nodes. We now create an interfaces table entry so that we do
not special code to find the control network interface. This entry is
delated along with the node entries when the experiment is swapped
out.

Of course, we still have existing nodes with jailip entries, so not
much code was removed, but this saves me from having to add more
special cases for XEN elabinelab, and at some point we can remove the
deprecated code.

USERNODE, shortcut to exec only, without the ssh.

username out of the db.  Don't want to try slogin as root from a script.

different then the original widearea code. Simpler, less dynamic.

First off, the wanodecreate script creates a new widearea_nodeinfo
entry.  These are nodes that will later checkin and be created as a
real node.  The input is a little xml file that you can use to specify
the stuff in the table entry (city, state, zip, etc). You can also
provide a privkey (no more then 64 chars), or one will be generated
for you.  For each one of these, create a Dongle Boot and stash the
privkey as /etc/emulab/emulab-privkey on the dongle. You do not assign
the IP address; the node will tell us that when it checks in.

A node checks in like this:

	https://$bossname/wanodecheckin.php?IP=$IP&privkey=$privkey
               &hostname=$hostname

The web page is simply a stub that makes sure the arguments don't have
any illegal characters, and then passes off to the backend.

The backend script checks the privkey and finds the widearea_nodeinfo.
The first time the node checks in, the node is created (db/Node.pm)
(nodes table, interfaces table, etc), and the node is moved to hwdown.
Subsequent checkins watch for changes to the IP or hostname, and issue
named_setup calls as needed.

Doh!  sshtb needs to exit with the status of the child process when
trying sshv2 and able to connect.

Be default sshtb now tries to ssh to the specified node via protocol version 2.
It will try protocol version 1 if a v2 connection/auth fails.  This was a
little messy to implement since sshtb now has to fork the first ssh attempt and
wait to see if it succeeds (all the fun of dealing with signals and killing
off the child ssh process and whatnot).

before the exec to avoid holding open the mysqld socket in the new
process.

pass a string with embedded quotes, perl hands it off to a shell which
results in an extra shell wrapper for every ssh. Well, with SSH_ARGS
the way they are, that means we always get the extra shell. While this
is a nice optimization it actually matters mostly from
linktest_control where I want to make sure that the child that invokes
linktest on ops (an ssh) can be killed directly with TERM (say, if
user cancels linktest) without worrying about intervening shell
screwing with signals, etc.

way, we don't have to worry about sshtb getting killed but its child
process hanging around.

that jails do.  sshtb can now handle vnodeid's, and must be given a
vnodeid if it's a Plab node, because the username will differ
depending on this.

links that do not need to get created in the ops install target.

sshtb also checks for unified control nodes, and if the destination
host is one of them, just runs the command, rather than invoking it
remotely via ssh.

script that checks the database to see if local or remote. The problem
with this is that the ssh syntax makes it hard to determine the host
name by inspection. Would need to parse all the ssh args (bad idea),
ot work backwards and try to figure out the difference between the
command (which is not a string but a sequence of args) and the host
and the preceeding ssh args. Hell with that! Changed sshtb to require
a specific -host argument. Read the args and look for it. Error out of
not found, to catch improper usage.

The moral of this update: "sshtb [ssh args] -host <host> [more args ...]

node_reboot fail oddly cause the kill -TERM was killing the shell
process but not the ssh!

sshtb is a _very_ simple shell script that runs ssh with a few commandline
parameters, which make it play nicer in an script environment. These
parameters can be changed with the '--with-ssh-args' argument, but default to:
'-q -o "BatchMode yes" -o "StrictHostKeyChecking no"'
All ssh calls now use this script.