Fix: close consumer sockets in sessiond cleanup

Signed-off-by: David Goulet <dgoulet@efficios.com>
Fix: don't install libtap system wide

Signed-off-by: David Goulet <dgoulet@efficios.com>
Fix: add gpl and lgpl files to tarball

Fixes #581

Signed-off-by: David Goulet <dgoulet@efficios.com>