[CI] License change for libcluster

[Brian J. Watson]

To the OpenSSI and CI community-

As of the next 1.1/1.2 release of OpenSSI, libcluster will be under the
LGPL, so that ISVs may link proprietary applications with libcluster to
make them cluster-aware, without having to open-source them:

http://www.gnu.org/licenses/lgpl.html

The rest of OpenSSI and CI will continue to be under the GPL, which
requires that all derived work also be open-sourced:

http://www.gnu.org/licenses/gpl.html

Regards,

Brian