Fix: missing files in extra dist statement

Signed-off-by: David Goulet <dgoulet@efficios.com>
Update version to v2.4.0-rc3

Signed-off-by: David Goulet <dgoulet@efficios.com>
Fix: report to client when snapshot will be empty

This adds a new lttng error code being the "snapshot nodata".

Fixes #662

Signed-off-by: David Goulet <dgoulet@efficios.com>
Fix: delete metadata stream before destroying it

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Fix: zero out data structure before using it

Fixes #716

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