lttng: update 2.12 -> 2.13.0

Drop 0001-tests-regression-disable-the-tools-live-tests.patch
(mass-disabling of ptests) and replace that with more targeted fixes:

- a patch that adds explicit sleeps where races due to too tight timings
were observed (not a proper fix; upstream needs to figure out how
to sync explicitly and reliably)

- LD_LIBRARY_PATH so that helper binaries are able to find their
custom libraries they're linked with (we strip rpath from them
for reproducibility)

- set pgrep location explicitly as it used unconditionally
on target, but auto-detected (incorrectly) on the host

- enable kmod as it is available in target images

- correct various missing scripts, binaries, and inhibit stripping
where that is expected.

License-Update: license info consolidated in LICENSE
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>