lttng: Update statedump event names for UST 2.8

lttng: Update statedump event names for UST 2.8

LTTng 2.8 RC2 changes the name of the "soinfo" event to "bin_info".
Also, its "sopath" field becomes just "path".

No point supporting the older names since it was never part of a
released version.

See https://lists.lttng.org/pipermail/lttng-dev/2016-April/025764.html

Update corresponding tests to use the new DEBUG_INFO3 which has
the updated event names.

Change-Id: Ibfe5701d7cc281d2a055f36eb5f0a1a90caab6ec
Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Reviewed-on: https://git.eclipse.org/r/72241
Reviewed-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>