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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).

Add extension and vclass support. It should be working correctly now. There's a lot of ugliness w.r.t. hardware types and sliver types, while dealing with switches, nodes and vclasses. I have tried to hide most of it in rspec_parser_v2.cc and rspec_parser_helper.cc.

to be buggy and support for extensions needs to tested and in some cases,
there's more stuff that needs to go in as extensions.

Big commit with a lot of changes to add the rspec parser base class as well as for version 1 and version 2. These changes are not throughly tested yet, and the
extension support hasn't yet been integrated into the main parser. The v1 and v2 support has.