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).

In some cases systemd doesn't like our behavior of starting emulab services
from rc.local and killing them from the testbed service.  There's really no
reason to be doing it this way under systemd anyway, so make the testbed
service do both.

Need this when I create a client-side tarball, which does a client-install
with DESTDIR set.

This is a hack to avoid Emulab and systemd conflicts.  Basically, sometimes
our MFSes add swap devices to /etc/fstab that are incorrect (i.e., /dev/hda
instead of /dev/sda).  We could always add 'noauto' to the mount options so
systemd would ignore it, but we have legacy or deployed MFSes to deal with.
When systemd encounters one of these, it tries to start the device and halts
the boot process for a long time while waiting for the device to "start".

We can't edit the bogus /etc/fstab entry before system reads it, because
system reads it while the root is still mounted read-only, very early
on in the startup process.

systemd doesn't allow us to remove units (a swap device is a unit, just like
a service is a unit), so all we can do is, before the swap unit runs, cancel
any pending systemd jobs before they try to initialize the the bogus device(s).

Now invoke the ifcfg-eth99 dhclient hack from
/etc/sysconfig/network-scripts/ifup-emulabcnet,
not directly from ifcfg-eth99, since /etc/init.d/network stop sources
ifcfg-eth99 without telling it why it was sourced.  So, we define a custom
ifup script instead, triggered by the DEVICETYPE variable in
ifcfg-eth99 being set to emulabcnet, and by creating
/etc/sysconfig/network-scripts/ifup-emulabcnet.