credential is issued to the original creator, hopefully that is enough.
Nick can use this to generate credentials for his existing VTS shared
vlans.

shared. This was requested at GEC 18.

When unsharing (or terminating) a slice that contains shared vlans,
the sharing is revoked from all slices using that vlan.

that is currently being used by other experiments.

Add -i option to print out details of a specific vlan (who is using
the vlan).

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).

as ports come and go.

shared, I mean that an experiment can request that a port be put into
a vlan belonging to another experiment. This started out as a hack to
support openflow enabled vlans in Geni, but then I got a request to
make it a little more general purpose. You all know how that goes.

Okay, say you have an experiment E1 in some project and that
experiment has a link or lan call "lan0". You want other experiments
to be able to stick ports in that vlan. On boss, you would do this
after E1 is swapped in:

boss> wap sharevlan -o testbed,E1 lan0 mysharedlan

The -o option says to make the vlan open to anyone; without that
option, only admins can swap in an experiment that requests a port in
lan0.  The token "mysharedlan" is just a level of indirection for the
NS file (or rspec).

Next you create a new experiment E2, and in your NS file:

	$ns make-portinvlan $n1 "mysharedlan"

which says to create a lan with a interface on node n1, in the vlan
named by the token mysharedlan. The token keeps specific pid/eids out
of the NS file. 

When E2 is swapped in, assign does its thing, and the selected port is
added to the members list for lan0 in testbed,E1 and then we call
snmpit with the syncvlansfromtables (-X) option to get the port added.

When E2 is swapped out, we undo the members list and call snmpit with
the -X option again.

The access issue is a bit of hack of course (open or admins) but I did
not want to invent a new permission mechanism (yet).

And of course, this is still a work in progress.